Tag: Types Of Fish

  • Black Line Tetra Care Guide: Tank Setup, Diet, Tank Mates & More

    Black Line Tetra Care Guide: Tank Setup, Diet, Tank Mates & More

    Table of Contents

    The black line tetra is a fast, active schooler that needs swimming space. A 30-gallon minimum for a proper group. They move constantly and any tank that restricts their movement leads to stress and aggression. Give them room and they are one of the most dynamic schooling displays available.

    Black line tetras are built for speed. Give them room to run or do not get them.

    The Reality of Keeping Black Line Tetra

    Group size is not a suggestion. The minimum school size for black line tetra is not just a guideline. In small groups, these fish lose color, become stressed, and display abnormal behavior. A proper group of 6 to 8+ is where you start to see natural schooling behavior, full color expression, and the confidence that makes them worth keeping.

    Tank mate selection requires thought. The black line tetra is not aggressive in the traditional sense, but it is assertive enough to cause problems with the wrong companions. Slow-moving, long-finned species are targets. Fast, short-finned fish of similar size are fine. Plan your community around this reality.

    Hardy does not mean indestructible. The black line tetra tolerates a range of conditions, but it still needs basic care. Ammonia spikes, dramatic temperature swings, and neglected water changes will catch up to even the toughest species. The difference is margin of error, not immunity.

    Store appearance is not home appearance. Fish in store tanks are stressed, crowded, and under inappropriate lighting. The black line tetra almost always looks better in a properly set up home aquarium than it does at the store. Dark substrate, live plants, and appropriate lighting bring out colors and behaviors you will never see in a retail environment.

    Biggest Mistake New Owners Make

    Keeping them with fish small enough to eat. This is a predator. It will eat anything it can fit in its mouth. If you stock smaller fish with a black line tetra, you are feeding it expensive live food.

    Expert Take

    Predatory fish are not for everyone, but the black line tetra is one of the more manageable predatory species in the hobby. If you understand the feeding requirements, the tank mate restrictions, and the space needs, it is a genuinely fascinating fish to keep.

    Key Takeaways

    • Minimum tank size is 20 gallons (76 liters) for a school of 6+ fish
    • Extremely hardy and adaptable – tolerates pH from 6.0 to 8.0 and hardness from 2 to 20 dGH
    • Peaceful community fish that schools well with other similarly sized tetras and rasboras
    • Omnivore – readily accepts flake, pellet, frozen, and live foods
    • Great beginner species – one of the most forgiving tetras in the hobby
    Map showing the Amazon River Basin in South America
    Map by Kmusser, CC BY-SA 3.0, via Wikimedia Commons

    Species Overview

    Field Details
    Scientific Name Hyphessobrycon scholzei
    Common Names Black Line Tetra, Blackline Tetra, Scholze’s Tetra
    Family Acestrorhamphidae
    Origin Coastal rivers of eastern Brazil (Paraiba do Sul basin area)
    Care Level Easy
    Temperament Peaceful
    Diet Omnivore
    Tank Level Mid
    Maximum Size 2 inches (5 cm)
    Minimum Tank Size 20 gallons (76 liters)
    Temperature 72-82ยฐF (22-28ยฐC)
    pH 6.0-8.0
    Hardness 2-20 dGH
    Lifespan 3-5 years in captivity
    Breeding Egg scatterer
    Breeding Difficulty Easy
    Compatibility Community
    OK for Planted Tanks? Yes

    Classification

    Taxonomic Level Classification
    Order Characiformes
    Family Acestrorhamphidae (reclassified from Characidae, Melo et al. 2024)
    Genus Hyphessobrycon
    Species H. Scholzei (Ahl, 1937)

    The black line tetra was originally described by Ernst Ahl in 1937. The genus Hyphessobrycon is one of the largest and most diverse in the characin world, containing well over 150 described species. Many of these are popular aquarium fish, including bleeding heart tetras, flame tetras, and phantom tetras.

    Note on reclassification: The 2024 phylogenomic study by Melo et al. Reorganized the traditional family Characidae into four separate families. Hyphessobrycon was moved into the newly established family Acestrorhamphidae. Older references and many hobby sources still list this species under Characidae, so don’t be confused if you see it listed both ways.

    Origin & Natural Habitat

    The black line tetra is native to coastal river systems of eastern Brazil, primarily in the Paraiba do Sul basin region. This is not an Amazonian species. Its home waters are the smaller rivers and tributaries that drain the coastal lowlands of southeastern Brazil, flowing into the Atlantic Ocean.

    In the wild, black line tetras inhabit slow-moving streams and tributaries with sandy or muddy substrates. These waterways are typically bordered by vegetation, with overhanging branches and aquatic plants providing shade and cover. Fallen leaves and organic debris accumulate on the bottom, contributing tannins that slightly stain the water. The water conditions in these coastal drainages vary quite a bit, ranging from soft and slightly acidic in forested tributaries to moderately hard and neutral in more open areas.

    This broad range of natural conditions is a big reason why the black line tetra is so adaptable in captivity. These fish evolved in waterways where parameters shift with the seasons, and they’ve developed the flexibility to handle it. You’ll find other small characins sharing these habitats, along with small catfish species and various cichlids that prefer the same slow-moving waters.

    Map of the Amazon River Basin and South American river systems
    Map of South American freshwater habitats. Via Wikimedia Commons.

    Appearance & Identification

    Black Line Tetra (Hyphessobrycon scholzei) showing distinctive dark lateral stripe
    Black line tetra (Hyphessobrycon scholzei) displaying the bold dark lateral stripe that gives this species its common name. Image by A. Zarske et al, CC BY 4.0, via Wikimedia Commons.

    The black line tetra has a classic tetra body shape – moderately compressed and elongated with a slight upward curve to the profile. The defining feature is the bold, dark lateral stripe that runs from the tip of the snout straight through the eye and all the way back to the base of the caudal fin. This stripe is consistently dark and well-defined, giving the fish a clean, graphic appearance.

    The body color above the stripe is silvery with a subtle iridescent sheen that catches the light as the fish moves. Below the stripe, the belly is lighter silver to white. The fins are mostly transparent to slightly yellowish, with some individuals showing a faint tint in the anal and caudal fins. While it’s not the most colorful tetra in the hobby, the contrast between the bright silver body and that crisp dark line creates an understated elegance, especially when a school of them moves through a planted tank together.

    Male vs. Female

    Sexing black line tetras is straightforward once they’re mature. Females are noticeably rounder and fuller-bodied than males, especially when carrying eggs. When viewed from above, the difference in body width is easy to spot. Males are slimmer and slightly more streamlined. Males also show slightly more intense iridescence along the body, though the difference is subtle. The dark lateral stripe is equally prominent in both sexes.

    Average Size & Lifespan

    Adult black line tetras typically reach about 2 inches (5 cm) in total length. They’re a fairly standard size for a mid-range tetra, similar in length to species like the black phantom or serpae tetra. Most commercially available specimens are juveniles that will grow to full size within several months of purchase.

    In captivity, black line tetras have a lifespan of 3 to 5 years with proper care. Consistent water quality, a varied diet, and a stress-free environment with adequate schooling numbers are the keys to reaching the upper end of that range. Wild-caught and captive-bred specimens will have similar lifespans when kept under good conditions.

    Care Guide

    Tank Size

    A 20-gallon (76 liter) tank is the minimum for a school of 6 black line tetras. They’re active mid-water swimmers that appreciate horizontal swimming space, so a 20-gallon long is a better choice than a 20-gallon tall if you have the option. If you want a larger school of 10 or more, step up to a 30-gallon (114 liters) or bigger to give them the room they need to school naturally.

    Water Parameters

    Parameter Ideal Range
    Temperature 72-82ยฐF (22-28ยฐC)
    pH 6.0-8.0
    Hardness 2-20 dGH
    KH 2-15 dKH

    One of the biggest selling points of the black line tetra is its adaptability to water chemistry. The pH tolerance from 6.0 all the way to 8.0 means this fish will do fine in almost any tap water. Hardness tolerance is equally broad at 2 to 20 dGH, which covers everything from very soft to moderately hard water. If you’re a beginner who doesn’t want to mess around with RO water or buffer solutions, the black line tetra will work with whatever comes out of your tap.

    That said, stability matters more than hitting a specific number. Avoid sudden swings in pH or temperature, and your black line tetras will do just fine. Captive-bred specimens, which make up the majority of what’s available in the trade, are even more tolerant of varying conditions than wild-caught fish.

    Filtration & Water Flow

    Black line tetras don’t have strong preferences when it comes to filtration type. A standard hang-on-back filter or sponge filter will work well for a 20-gallon setup. For larger tanks, a canister filter provides excellent mechanical and biological filtration. Aim for gentle to moderate flow – these fish come from slow-moving waters in the wild and don’t appreciate being blasted by a strong current.

    Weekly water changes of 20-25% are recommended. Black line tetras are hardy, but consistent maintenance keeps them looking their best and helps prevent the gradual decline in water quality that leads to health problems over time.

    Lighting

    Moderate lighting works best for black line tetras. They’re not particularly light-sensitive, but they do show better color and more confident behavior when the lighting isn’t overly intense. If you’re running a planted tank with stronger lights, provide some shaded areas with floating plants or tall background plants where they can retreat. The iridescent sheen on their body really catches the eye under moderate, angled lighting.

    Plants & Decorations

    Black line tetras look their best in a planted tank with a mix of open swimming space and planted areas along the sides and back. Good plant choices include Java Fern, Anubias, Vallisneria, and Amazon Swords for background coverage. Floating plants like Amazon Frogbit or Water Lettuce provide dappled shade that mimics their natural habitat.

    Driftwood and smooth rocks add visual interest and create natural boundaries in the tank. A few pieces of driftwood also leach tannins into the water, which these fish appreciate even if they don’t require blackwater conditions. Leave the center and front of the tank relatively open so the school has room to swim together.

    Substrate

    Fine gravel or sand both work well. A darker substrate is recommended because it brings out the contrast of the silver body and dark stripe. On a light-colored substrate, the fish will look washed out. Dark sand or dark fine gravel will make your school of black line tetras really stand out.

    Is the Black Line Tetra Right for You?

    Before you buy, run through this honest checklist. The Black Line Tetra is a great fish for the right keeper, but it is not for everyone.

    • You want a mid-sized tetra with a clean, bold horizontal stripe
    • You have a 30-gallon or larger tank with open swimming space
    • You can keep a school of 6 to 8+ for proper schooling behavior
    • You want a hardy species that adapts to a wide range of water conditions
    • Your tank has some current flow. These are active swimmers that enjoy movement
    • You appreciate clean, graphic patterning over flashy coloring

    Tank Mates

    Black line tetras are peaceful community fish that get along well with a wide range of similarly sized, non-aggressive species. Their mid-water swimming habit means they won’t compete with bottom dwellers or surface specialists.

    Best Tank Mates

    • Corydoras catfish – peaceful bottom dwellers that occupy a completely different zone
    • Harlequin Rasboras – similar size and temperament, excellent mid-level companions
    • Neon Tetras – a classic pairing that adds color contrast to the school
    • Ember Tetras – small and peaceful, the warm orange against the black line tetra’s silver looks great
    • Cherry Barbs – peaceful barbs that won’t cause any problems
    • Otocinclus – gentle algae eaters that stay out of the way
    • Bristlenose Plecos – bottom-dwelling algae eaters compatible with most community setups
    • Kuhli Loaches – peaceful nocturnal bottom dwellers
    • Pristella Tetras – similar care requirements and peaceful nature
    • Dwarf Gouramis – add a centerpiece fish without aggression concerns

    Tank Mates to Avoid

    • Large Cichlids – anything big enough to eat them will eventually try
    • Tiger Barbs – notorious fin nippers that can harass peaceful tetras
    • Bettas – the confined space of most betta setups and potential for aggression make this a bad match
    • Jack Dempseys – far too aggressive and predatory for small tetras
    • Red Tail Sharks – territorial bottom-to-mid dwellers that can bully peaceful schoolers

    Food & Diet

    Black line tetras are true omnivores that will eat just about anything you offer. A high-quality flake food or micro pellet should form the base of their diet. Brands like Hikari Micro Pellets or Fluval Bug Bites are excellent staples that provide balanced nutrition.

    Supplement the staple diet with frozen foods like bloodworms, brine shrimp, and daphnia 2-3 times per week. These add variety and help bring out the best coloration. Live foods like baby brine shrimp and daphnia are also accepted eagerly and make excellent conditioning foods if you’re planning to breed them.

    Feed twice daily, offering only what the school can consume within 2-3 minutes per feeding. Black line tetras are enthusiastic eaters that will gorge themselves if given the chance, so portion control prevents overfeeding and keeps the water clean.

    Pro tip: Occasionally offering finely crushed vegetable flakes or blanched spinach adds dietary variety that supports long-term health. Omnivores benefit from plant matter in their diet even if they don’t actively seek it out.

    Breeding & Reproduction

    Black line tetras are one of the easier tetra species to breed in the home aquarium. They’re egg scatterers that will spawn readily once conditions are right, making them a good choice for hobbyists looking to try their hand at breeding characins for the first time.

    Breeding Difficulty

    Easy. Black line tetras spawn willingly in captivity and don’t require extreme water conditions to trigger breeding behavior. With basic conditioning and a dedicated spawning setup, most hobbyists can get them to spawn without much difficulty.

    Spawning Tank Setup

    Set up a separate breeding tank of 10 gallons (38 liters) or larger. Keep the lighting dim and cover the sides of the tank if possible to reduce stress. Place a layer of Java moss, spawning mops, or fine-leaved plants like Cabomba on the bottom to give the eggs something to fall into. A mesh or grid placed just above the bottom works well to prevent the adults from eating the eggs after spawning.

    Use a gentle sponge filter for filtration. Strong flow will scatter the eggs and stress the spawning pair.

    Water Conditions for Breeding

    While black line tetras tolerate a wide range of conditions for general keeping, slightly softer and more acidic water helps trigger spawning. Aim for a pH of 6.0-6.5, hardness around 4-8 dGH, and a temperature of 78-80ยฐF (26-27ยฐC). A partial water change with slightly cooler, soft water can mimic the seasonal rains that trigger spawning in the wild.

    Conditioning & Spawning

    Condition a group of adults (2-3 pairs works well) with generous feedings of live and frozen foods for 1-2 weeks before introducing them to the breeding tank. Daphnia, baby brine shrimp, and bloodworms are all effective conditioning foods. Females will become noticeably plumper as they fill with eggs.

    Introduce the conditioned group to the spawning tank in the evening. Spawning typically occurs the following morning as the first light hits the tank. The males will chase the females through the plants, and eggs are scattered among the vegetation and across the bottom. A healthy female can produce 200-300 eggs per spawning event.

    Remove the adults immediately after spawning is complete, as they will eat the eggs given the opportunity.

    Egg & Fry Care

    The eggs are small, clear, and slightly adhesive. They hatch in approximately 24-36 hours at 78ยฐF (26ยฐC). The fry are tiny and will remain attached to the substrate or plants, absorbing their yolk sacs for the first 2-3 days. Once they become free-swimming, start feeding infusoria or liquid fry food.

    After about a week, the fry will be large enough to accept microworms. At 2-3 weeks, graduate them to freshly hatched baby brine shrimp, which provides excellent nutrition for rapid growth. The fry are light-sensitive in the early stages, so keep the breeding tank dimly lit for the first week or so.

    Growth is steady with frequent small feedings and good water quality. Small water changes of 10% every other day help maintain conditions without shocking the fry. Most commercially available black line tetras are captive-bred, which speaks to how readily this species reproduces in aquarium conditions.

    Common Health Issues

    Black line tetras are hardy fish that don’t have any species-specific diseases to worry about. However, like all freshwater fish, they’re susceptible to a few common conditions.

    Ich (White Spot Disease)

    Ich is the most common ailment in community tanks, and black line tetras can contract it just like any other fish. You’ll see small white spots on the body and fins, along with flashing (rubbing against objects). Raise the temperature to 82-84ยฐF (28-29ยฐC) gradually and treat with a copper-based or malachite green medication. Catching it early makes treatment straightforward.

    Fin Rot

    Fin rot typically shows up as ragged, deteriorating fin edges, often with redness at the base. It’s almost always caused by poor water quality or stress. Improving water conditions through more frequent water changes and cleaning the substrate usually resolves mild cases. Severe infections require antibacterial treatment.

    Columnaris

    This bacterial infection appears as white or grayish patches on the body, often around the mouth or along the lateral line. It spreads quickly in warm water with poor conditions. Quarantine affected fish and treat with antibacterial medications. Prevention is simple: maintain clean water and avoid overcrowding.

    The best defense against all of these is prevention. Quarantine new fish for 2-3 weeks before adding them to your main tank, maintain consistent water quality, and avoid overstocking.

    Common Mistakes to Avoid

    • Keeping too few. Black line tetras are schooling fish that need a group of at least 6 to feel secure. In smaller numbers, they become stressed, hide constantly, and may even nip at tank mates out of anxiety.
    • Skipping the cycle. Even though black line tetras are hardy, they shouldn’t be used to cycle a new tank. Always complete the nitrogen cycle before adding any fish. Hardy doesn’t mean invincible.
    • Ignoring lid security. While not extreme jumpers, black line tetras can and will jump if startled or if water quality deteriorates. A well-fitting lid is essential.
    • Using a light substrate. This isn’t a health issue, but it will make your fish look dull. Dark substrates bring out the best contrast in the silver body and dark stripe.

    Where to Buy

    Black line tetras are not as commonly stocked as neon tetras or black skirt tetras, but they’re available from specialty retailers and online sellers. Your best bets for finding healthy, well-acclimated specimens are:

    • Flip Aquatics – excellent source for quality freshwater fish with reliable shipping
    • Dan’s Fish – another trusted online retailer specializing in freshwater species
    • Local fish stores – independent shops are more likely to carry this species than big chain pet stores, and many can special order them for you

    Most black line tetras in the trade are captive-bred, which means they’re already adapted to aquarium conditions and will ship well. Expect to pay in the $3-5 range per fish, with discounts often available for larger groups.

    Frequently Asked Questions

    How many black line tetras should be kept together?

    A minimum of 6, with 8-10 being ideal. Black line tetras are schooling fish that rely on group numbers for security. In larger groups, they display more natural schooling behavior and bolder coloration. Keeping fewer than 6 leads to stressed, skittish fish that may nip at tank mates.

    What size tank does a black line tetra need?

    A 20-gallon (76 liter) tank is the minimum for a school of 6. These are active mid-water swimmers that need horizontal space to school properly. A 20-gallon long provides the best footprint for a small group, while a 30-gallon (114 liters) or larger is better for groups of 10 or more.

    Are black line tetras easy to care for?

    Yes. Black line tetras are among the easiest tetras to keep. They tolerate a wide range of water conditions (pH 6.0-8.0, hardness 2-20 dGH), eat virtually any food, and are resistant to most common diseases. They’re an excellent choice for beginners setting up their first community tank.

    Can black line tetras live with shrimp?

    Adult Amano shrimp and larger shrimp species are safe with black line tetras. However, small shrimp like cherry shrimp and their juveniles may be picked off, especially baby shrimp. If you keep both, provide plenty of dense plant cover and moss where shrimp can hide and breed safely.

    How long do black line tetras live?

    With proper care, black line tetras typically live 3 to 5 years in captivity. Maintaining stable water conditions, feeding a varied diet, and keeping them in an appropriately sized school are the biggest factors in reaching the upper end of that range.

    Are black line tetras fin nippers?

    No. Black line tetras are genuinely peaceful fish that don’t have a reputation for fin nipping. They’re a safe choice alongside long-finned species, though very slow-moving tank mates with elaborate fins should always be monitored during the initial introduction period.

    Why is my black line tetra losing color?

    Color loss in black line tetras is caused by stress, poor water quality, or inadequate group size. Check your water parameters, make sure you have at least 6 fish in the group, and verify that no aggressive tank mates are causing stress. A dark substrate and moderate lighting also help these fish display their best coloration.

    What It Is Actually Like Living With Black Line Tetra

    In a proper school, black line tetra display natural movement patterns that are genuinely engaging to watch. The fish interact with each other, establish subtle hierarchies, and move through the tank with purpose.

    They spend most of their time near the surface, which fills a level of the tank that many other species ignore. This makes them excellent complements to mid-water and bottom-dwelling fish.

    Feeding time is when their personality comes out. They learn your routine quickly and will anticipate feeding before you even open the lid.

    Their color and behavior improve over time as they settle into a stable environment. Fish that have been in the same tank for months look noticeably better than recently added stock.

    They coexist peacefully with virtually every other appropriately-sized community fish. This compatibility makes tank planning straightforward.

    How the Black Line Tetra Compares to Similar Species

    Black Line Tetra vs. Penguin Tetra

    Both are mid-sized tetras with dark horizontal stripes. The Penguin Tetra has the distinctive oblique stripe that extends into the tail. The Black Line Tetra has a cleaner, straighter stripe. Both are hardy and active. The Penguin Tetra is more commonly available.

    Black Line Tetra vs. Black Neon Tetra

    The Black Neon Tetra is smaller and has a two-toned stripe (dark line with iridescent line above). The Black Line Tetra is larger with a bolder single stripe. For smaller tanks, the Black Neon works better. For larger community setups, the Black Line Tetra fills the space.

    Closing Thoughts

    The black line tetra is a solid, reliable community fish that proves you don’t need flashy colors to make a great impression. That clean dark stripe against the silvery body looks sharp in any planted tank, and the sheer adaptability of this species makes it one of the most beginner-friendly tetras you can find. It eats everything, tolerates a wide range of water conditions, and breeds without much fuss.

    If you’re looking for more tetra species to keep alongside your black line tetras, check out our care guides for pristella tetras, flame tetras, and silvertip tetras. For a full overview of the best tetras in the hobby, visit our complete tetras guide.

    Have you kept black line tetras? I’d love to hear about your experience with them. Drop a comment below!

    Check out our tetra tier list video where we rank the most popular tetras in the hobby, including the black line tetra:

    References

  • Pink-Tailed Chalceus Care Guide: Tank Setup, Diet, Tank Mates & More

    Pink-Tailed Chalceus Care Guide: Tank Setup, Diet, Tank Mates & More

    Table of Contents

    The pink-tailed chalceus is a large, powerful predatory fish that reaches 10 inches or more and needs a tank to match. It is fast, active, and has a striking appearance with its large silver body and distinctive pink-red tail that gives it its name. This is not a community fish for standard setups. It is a large predator that requires serious space, strong filtration, and tank mates that are too big to eat.

    Fast, large, and predatory. This is big-fish fishkeeping in the characin family.

    A 75-gallon minimum, ideally 125+. Powerful filtration. A tight-fitting lid because they jump. Tank mates that match their size. This is a serious commitment.

    The pink-tailed chalceus is for keepers who love tetras but want something at a completely different scale. It bridges the gap between community tetras and monster fish keeping.

    The Reality of Keeping Pink-Tailed Chalceus

    They grow large and fast. Pink-tailed chalceus reach 10 inches or more and grow rapidly with good feeding. A juvenile that looks manageable at 3 inches will outgrow a small tank within months.

    They are jumpers. Like many large characins, the pink-tailed chalceus is an active jumper. A tight, weighted lid is essential. They have the power to push lightweight lids aside.

    The pink-red tail is the signature feature. The vibrant pink-red caudal fin is striking against the silver body and is one of the most distinctive features of any large characin. Color intensity varies with diet, water quality, and age.

    Biggest Mistake New Owners Make

    Buying a juvenile without planning for the adult size. This fish grows fast and reaches 10+ inches. A 20-gallon “starter tank” leads to a stunted, stressed fish within months.

    Expert Take

    The pink-tailed chalceus is an impressive, fast-growing predatory characin that rewards keepers who provide the space and filtration it demands. If you are looking for a large, active fish with real presence, this species delivers.

    Key Takeaways

    • Minimum tank size is 75 gallons (284 liters) for a single specimen, larger for a group
    • Semi-aggressive predator that will eat smaller tank mates like tetras, rasboras, and small livebearers
    • Powerful jumper that absolutely requires a tight-fitting, weighted lid with no gaps
    • Omnivore with predatory tendencies – eats insects, smaller fish, and plant matter
    • Long-lived display fish with a lifespan of 8 to 12 years in proper conditions
    Map showing the Amazon River Basin in South America
    Map by Kmusser, CC BY-SA 3.0, via Wikimedia Commons

    Species Overview

    FieldDetails
    Scientific NameChalceus macrolepidotus
    Common NamesPink-Tailed Chalceus, Pink Tail Chalceus
    FamilyChalceidae
    OriginAmazon and Orinoco basins, Guyana, Suriname
    Care LevelModerate to Advanced
    TemperamentSemi-aggressive, predatory
    DietOmnivore (predatory tendencies)
    Tank LevelTop to Mid
    Maximum Size10 inches (25 cm)
    Minimum Tank Size75 gallons (284 liters)
    Temperature73-82ยฐF (23-28ยฐC)
    pH6.0-7.5
    Hardness2-15 dGH
    Lifespan8-12 years in captivity
    BreedingNot commonly bred in captivity
    Breeding DifficultyDifficult
    CompatibilityLarge fish community
    OK for Planted Tanks?Yes (may nibble soft plants)

    Classification

    Taxonomic LevelClassification
    OrderCharaciformes
    FamilyChalceidae
    GenusChalceus
    SpeciesC. Macrolepidotus (Cuvier, 1818)

    The genus Chalceus is a small group containing only a handful of species, all large-bodied characins from South America. Unlike many tetra and characin genera that were affected by the 2024 Melo et al. Phylogenomic reclassification of Characidae, the family Chalceidae was not impacted by that revision. Chalceus macrolepidotus was originally described by Georges Cuvier in 1818, making it one of the earliest characiform species formally documented by Western science.

    Origin & Natural Habitat

    Map of the Amazon River basin, native range of the Pink-Tailed Chalceus
    Map of the Amazon River basin. The Pink-Tailed Chalceus is found throughout the Amazon and Orinoco drainages. Image by Kmusser, CC BY-SA 3.0, via Wikimedia Commons.

    The pink-tailed chalceus has one of the broader distributions of any large characin in South America. It ranges across the Amazon basin, the Orinoco basin, and the river systems of Guyana and Suriname. This wide distribution means it inhabits a variety of water types, from tannin-stained blackwater tributaries to clearer main river channels.

    In the wild, these fish are typically found in larger rivers and flooded forest areas where there is room to swim and plenty of prey. They’re surface-oriented hunters, often cruising just below the water’s surface looking for insects that have fallen in, small fish, and plant material like fruits and seeds. During the rainy season, they move into flooded forest zones where food is abundant.

    The natural habitat features warm, soft to moderately hard water with a slightly acidic to neutral pH. The substrate is usually a mix of sand and organic debris, with submerged logs and overhanging vegetation providing cover and shade. Understanding their preference for open swimming space near the surface is key to setting up a successful aquarium for this species.

    Appearance & Identification

    Pink-Tailed Chalceus (Chalceus macrolepidotus) close-up showing iridescent scales in an aquarium
    Pink-Tailed Chalceus (Chalceus macrolepidotus). Photo via Wikimedia Commons, CC BY-SA 2.0.

    The pink-tailed chalceus is a genuinely impressive fish to look at. The body is deep, laterally compressed, and covered in extremely large, highly reflective silver scales that shimmer like polished chrome under aquarium lighting. Each individual scale is clearly visible, giving the fish an almost armored appearance. The name “macrolepidotus” literally means “large-scaled,” and it’s well earned.

    The defining feature is the caudal (tail) fin, which ranges from pink to deep red depending on the individual’s condition and mood. This splash of color against the metallic silver body is what makes this fish such a showstopper. The dorsal fin also carry a pinkish or reddish tinge in well-kept specimens. The eyes are relatively large, suited for a surface-oriented predator that relies on vision to find prey.

    One thing worth noting is that coloration can vary somewhat depending on where the fish was collected. Specimens from different river systems may show slightly different intensities of red or pink in the fins. In aquarium conditions, good diet and clean water will bring out the best color.

    Male vs. Female

    Sexing pink-tailed chalceus is difficult outside of spawning condition. Mature females are slightly deeper-bodied and rounder in the belly when carrying eggs. Males may be slightly more streamlined and show marginally more intense color in the caudal fin, but these differences are subtle at best. There are no reliable external markers like fin extensions or dramatic color differences to distinguish the sexes, which is part of why captive breeding has proven so challenging.

    Average Size & Lifespan

    This is a big fish. Adult pink-tailed chalceus reach up to 10 inches (25 cm) in total length, though most aquarium specimens settle in the 8 to 10 inch (20 to 25 cm) range. They’re bulky, too, with a deep body that adds to their overall presence in a tank. Don’t let juveniles at the store fool you. That 3-inch fish will grow quickly with proper feeding.

    In captivity, pink-tailed chalceus have a lifespan of 8 to 12 years when provided with adequate space, clean water, and a varied diet. That’s a significant commitment, so plan accordingly before adding one to your setup. These are fish that is with you for a decade or more.

    Care Guide

    Tank Size

    A 75-gallon (284-liter) tank is the minimum for a single pink-tailed chalceus, but honestly, bigger is always better with a fish this active. If you want to keep a small group of 3 or more (which is ideal since they’re more confident and display better behavior in groups), you’re looking at 125 gallons (473 liters) or larger. A 6-foot tank is preferable because these fish are fast, powerful swimmers that need horizontal space to cruise.

    The tank needs to be long rather than tall. Pink-tailed chalceus spend most of their time in the upper half of the water column, so a standard rectangular tank with plenty of length gives them the swimming room they need. A cramped tank will lead to stress, fin damage from hitting the glass, and a miserable fish that never shows its best behavior.

    Water Parameters

    ParameterIdeal Range
    Temperature73-82ยฐF (23-28ยฐC)
    pH6.0-7.5
    Hardness2-15 dGH
    KH1-10 dKH

    The pink-tailed chalceus is reasonably adaptable when it comes to water chemistry. Its wide natural distribution across multiple river systems means it encounters a range of conditions in the wild, and captive specimens reflect that flexibility. They do best in soft to moderately hard water with a slightly acidic to neutral pH, but they’re not as demanding as some blackwater specialists.

    What matters most is stability. These are large, messy eaters that produce a significant bioload, so keeping water quality high is the real challenge. Ammonia and nitrite must be at zero, and nitrates should be kept below 20 ppm through regular water changes. Sudden parameter swings are harder on large fish than many people realize.

    Filtration & Water Flow

    Strong filtration is non-negotiable for a fish this size. A canister filter rated for your tank volume (or even slightly above) is the way to go. These fish produce a heavy bioload, especially when fed protein-rich foods, and an underpowered filter will struggle to keep up. Running two smaller canisters or adding a large sponge filter as supplemental biological filtration is a smart move for tanks over 100 gallons.

    Moderate water flow suits them well. In the wild, they inhabit both slow-moving tributaries and larger river channels with more current, so they’re comfortable with a reasonable amount of flow. Avoid dead spots where waste can accumulate, but you don’t need powerheads blasting current across the tank.

    Weekly water changes of 25-30% are recommended. With a large, predatory fish producing a heavy bioload, consistent water changes are the single most important thing you can do to keep your chalceus healthy long-term.

    Lighting

    Moderate lighting works best for pink-tailed chalceus. They’re not shy about being in the open, but extremely bright lighting can make them skittish since they’re naturally surface dwellers that are wary of overhead predators. A standard LED aquarium light at moderate intensity will show off their reflective scales beautifully without stressing them out.

    Some floating plant cover is a nice touch. It creates areas of shade and light across the surface, giving the fish the option to move between brighter and dimmer zones. This mimics the natural canopy effect of overhanging vegetation in their native rivers.

    Plants & Decorations

    Keep the layout simple and open. Pink-tailed chalceus are fast, surface-oriented swimmers, and cluttered tanks with dense hardscape will stress them out and lead to injuries. Think big pieces of driftwood positioned along the back and sides, leaving the central and upper areas of the tank wide open for swimming.

    Hardy plants like Java fern, Anubias, and Vallisneria can work, but be aware that chalceus may nibble on softer-leaved plants as part of their omnivorous diet. Tough, bitter-tasting species are your best bet. Floating plants like Amazon frogbit or water lettuce are excellent for creating surface shade and making the fish feel more secure.

    Large rocks and driftwood pieces should be stable and well-positioned. A startled chalceus can launch itself across the tank at surprising speed, and loose decorations can become projectiles. Secure everything.

    Substrate

    Sand or fine gravel both work well. A dark substrate will make the silver scales and pink tail pop with more contrast, while a lighter substrate creates a different but still attractive look. Since pink-tailed chalceus rarely interact with the substrate (they’re upper-water fish), the choice comes down mostly to aesthetics and what works best for your plants and bottom-dwelling tank mates.

    Tank Mates

    Best Tank Mates

    The golden rule with pink-tailed chalceus is simple: if it fits in their mouth, it’s food. Tank mates need to be too large to be swallowed. Stick with robust, similarly sized fish that can hold their own:

    • Silver dollar fish – peaceful, large-bodied schooling fish that occupy the mid-level and make excellent companions
    • Payara (vampire tetra) – another large characin for experienced keepers with very large setups
    • Severum cichlids – large, relatively peaceful cichlids that coexist well with big characins
    • Geophagus eartheaters – bottom-dwelling cichlids that stay out of the chalceus’s territory near the surface
    • Plecostomus (large species) – armored catfish that are too spiny and large to be bothered
    • Oscar cichlids – similarly sized and robust enough to coexist, though monitor for aggression
    • Bichirs – bottom-dwelling predators that occupy a completely different zone in the tank
    • Large tinfoil barbs – fast, tough schooling fish that are too big to be eaten
    • Flagtail prochilodus – large, active characins that make lively tank mates
    • Arowana (in very large tanks) – another surface predator, but only suitable in 300+ gallon setups

    Tank Mates to Avoid

    • Neon tetras, cardinal tetras, and other small tetras – they will be eaten, full stop
    • Guppies, platies, and small livebearers – these are snacks, not tank mates
    • Small rasboras and danios – anything under 3 inches (8 cm) is at risk
    • Dwarf cichlids (Apistogramma, rams) – too small and slow to survive with a surface predator
    • Shrimp of any kind – they will be hunted down and eaten overnight
    • Slow-moving, long-finned fish – fancy goldfish, bettas, and similar fish are too vulnerable

    Food & Diet

    Pink-tailed chalceus are enthusiastic eaters with a diet that reflects their predatory nature. In the wild, they eat insects (especially those that fall on the water surface), smaller fish, crustaceans, plant matter, and fallen fruits. In captivity, variety is the key to keeping them healthy and colorful.

    A quality cichlid pellet or large carnivore stick makes a good daily staple. Supplement regularly with frozen foods like krill, silversides, large mysis shrimp, and bloodworms. Live foods such as crickets, earthworms, and feeder shrimp are taken eagerly and help keep the fish active and engaged. Don’t skip the plant-based component either. Blanched spinach, spirulina-based pellets, and even pieces of fresh fruit (grapes, banana) will be accepted and contribute to a balanced diet.

    Feeding frequency: Once or twice daily for adults. Juveniles benefit from two smaller feedings per day. Only offer what they can consume in about 3 to 5 minutes per feeding.

    Pro tip: Dropping insects like crickets or mealworms on the water surface triggers their natural surface-hunting instinct and is genuinely fun to watch. It also provides enrichment that keeps them from getting bored in captivity.

    Is the Pink-Tailed Chalceus Right for You?

    Before you add a Pink-Tailed Chalceus to your tank, here is an honest assessment of what you’re signing up for. I’d rather you know exactly what to expect now than find out the hard way after you’ve already bought one.

    • Experience level: Pink-Tailed Chalceuss are best suited for intermediate to advanced keepers. They have specific requirements that can overwhelm beginners.
    • Tank size commitment: You’ll need at least 75 gallons, though bigger is always better. Make sure you have room for the tank before buying.
    • Tank mate planning: Pink-Tailed Chalceuss can be territorial, so plan your community carefully. Not every fish will work as a tank mate.
    • Maintenance demands: Expect regular water testing and consistent water changes. Pink-Tailed Chalceuss are sensitive to parameter fluctuations.
    • Budget reality: Keeping Pink-Tailed Chalceuss costs more than typical setups. Budget for ongoing costs, not just the initial purchase.
    • Time investment: Beyond daily feeding and weekly maintenance, regular observation is the best way to catch health issues early.
    • Long-term commitment: With proper care, Pink-Tailed Chalceuss can live up to 12 years. Make sure you’re ready for years of consistent care.

    Breeding & Reproduction

    Breeding the pink-tailed chalceus in home aquaria is extremely rare and not well documented. This is one of those species where captive breeding has proven to be a genuine challenge, and most specimens in the trade are wild-caught.

    Breeding Difficulty

    Difficult. There are very few confirmed reports of successful captive breeding in home aquariums. The fish’s large adult size, space requirements, and the difficulty of conditioning them to spawn make this a project only for advanced hobbyists with very large setups.

    Spawning Tank Setup

    If you want to attempt breeding, you’ll need a very large, dedicated spawning tank of at least 150 gallons (568 liters) or more. The tank should have a gentle current, subdued lighting, and plenty of open swimming space. Fine-leaved plants or spawning mops near the surface could serve as egg-catching sites. A secure, tight-fitting lid is absolutely essential since spawning activity is vigorous and can result in fish launching themselves out of the tank.

    Water Conditions for Breeding

    Based on limited reports, breeding attempts should focus on replicating rainy season conditions. Softer, slightly acidic water (pH 6.0-6.5, hardness 2-8 dGH) at temperatures around 78-82ยฐF (26-28ยฐC) may help trigger spawning. Gradual temperature drops followed by warming, combined with increased water changes using cooler water, can simulate the onset of the wet season. RO or peat-filtered water may help achieve the necessary softness.

    Conditioning & Spawning

    Condition a group of at least 3 to 4 fish (ideally with a mix of males and females, though sexing is difficult) with a protein-rich diet heavy on live and frozen foods for several weeks. Earthworms, crickets, and small feeder fish can all be part of the conditioning regime. Look for females developing a noticeably rounder belly profile as a sign of egg development.

    Spawning behavior in related species typically involves vigorous chasing and surface activity. The exact spawning mechanics of C. Macrolepidotus in captivity are not well described, but they are believed to be egg scatterers. Egg counts from related species suggest a large female could produce several thousand eggs per spawn.

    Egg & Fry Care

    If spawning does occur, remove the adults promptly as they will likely consume the eggs. Eggs are expected to hatch within 24 to 48 hours depending on temperature. Fry would need infusoria or liquid fry food initially, graduating to baby brine shrimp as they grow. Keep the spawning tank dimly lit, as eggs and young fry of most characins are light-sensitive.

    Given the rarity of captive spawning, most pink-tailed chalceus in the hobby are wild-caught from their native range. If you do manage to breed them, document everything. The hobby needs more information on reproducing this species in captivity.

    Common Health Issues

    Pink-tailed chalceus are generally robust fish when kept in clean, well-maintained water. Their main health risks will come from environmental factors rather than species-specific diseases.

    Jump-Related Injuries

    This is by far the most common health issue with this species, and it’s entirely preventable. Pink-tailed chalceus are explosive jumpers, and fish that hit the lid hard can damage their snout, lose scales, or injure their spine. In the worst cases, they clear the lid entirely and end up on the floor. Every injury from jumping opens the door to secondary bacterial or fungal infections. Prevention is simple: a tight-fitting, weighted lid with absolutely no gaps.

    Ich (White Spot Disease)

    Like most tropical fish, pink-tailed chalceus can contract ich when stressed, typically from temperature fluctuations or being introduced to a new tank. The large scale size makes white spots easy to spot. Gradually raise the temperature to 82-84ยฐF (28-29ยฐC) and treat with a standard ich medication. Large characins generally respond well to treatment when caught early.

    General Prevention

    The best approach is prevention through water quality. With a heavy bioload from a large predatory fish, ammonia spikes after feeding are a real concern if your filtration can’t keep up. Quarantine all new fish before adding them to a tank with established chalceus, maintain a rigorous water change schedule, and avoid overcrowding. Wild-caught specimens should be quarantined for at least 3 to 4 weeks and monitored for parasites, which are more common in wild-collected fish.

    Common Mistakes to Avoid

    • No lid or a loose-fitting lid – This is mistake number one with pink-tailed chalceus and it’s the one that kills the most fish. These are among the strongest jumpers in the freshwater hobby. They can clear gaps you wouldn’t think possible. You need a heavy, tight-fitting lid with NO openings. Weight it down if necessary. Every chalceus keeper has a jumping horror story, and they all wish they’d taken the lid more seriously.
    • Keeping them with small fish – That school of neon tetras or group of fancy guppies will become an expensive midnight snack. If a fish fits in the chalceus’s mouth, it will get eaten. This is not aggression; it’s predation. Only house them with fish too large to be swallowed.
    • Undersized tank – Buying a juvenile from the store and putting it in a 30-gallon tank is a recipe for a stressed, stunted fish. These grow fast and need serious swimming space. Plan for the adult size from day one.
    • Skipping water changes – Large predatory fish produce a heavy bioload. If you’re not doing consistent weekly water changes of 25-30%, water quality will deteriorate faster than you might expect, leading to stress and disease.

    Where to Buy

    Pink-tailed chalceus are not as widely available as common community fish, but they show up regularly at specialty fish stores and from online retailers that stock larger South American species. Expect to pay anywhere from $15 to $40 per fish depending on size and source. Most specimens available in the trade are wild-caught.

    For reliable sourcing, check with Flip Aquatics and Dan’s Fish. Both carry a rotating selection of South American species and often source fish that aren’t in their regular inventory if you reach out. Your local fish store also be able to special order them from their suppliers if they don’t stock them regularly.

    Frequently Asked Questions

    Will a pink-tailed chalceus jump out of my tank?

    Yes, absolutely. Pink-tailed chalceus are among the most powerful jumpers in the freshwater hobby. They can launch themselves out of the water with startling force, especially when spooked, during feeding, or at night. A heavy, tight-fitting lid with no gaps is completely non-negotiable. This is not a fish you can keep in an open-top aquarium under any circumstances.

    How many pink-tailed chalceus should be kept together?

    While they is kept singly, pink-tailed chalceus are more confident and show better behavior in groups of 3 or more. A group helps spread out any semi-aggressive tendencies and results in bolder, more active fish. However, keeping a group requires a large tank of 125 gallons (473 liters) or more to give them enough space.

    What size tank does a pink-tailed chalceus need?

    A minimum of 75 gallons (284 liters) for a single fish, though 125 gallons (473 liters) or larger is strongly recommended if keeping a group. A 6-foot long tank is ideal because these are fast, active swimmers that need plenty of horizontal swimming room. Length matters more than height for this surface-oriented species.

    Are pink-tailed chalceus aggressive?

    They’re semi-aggressive and predatory rather than truly aggressive in the territorial sense. They won’t typically fight with similarly sized fish, but they will absolutely eat anything small enough to fit in their mouth. Aggression toward tank mates of similar size is generally limited to occasional chasing, especially around feeding time. Keeping them in a group and providing adequate space reduces this behavior significantly.

    What do pink-tailed chalceus eat?

    They’re omnivores with predatory tendencies. In captivity, feed a varied diet of quality pellets, frozen foods (krill, silversides, bloodworms), and occasional live foods like crickets and earthworms. They also accept plant matter including blanched vegetables and spirulina-based foods. Variety is important for long-term health and vibrant coloration.

    How long do pink-tailed chalceus live?

    With proper care, pink-tailed chalceus live 8 to 12 years in captivity. This is a long-term commitment, so be prepared for a decade or more with this fish. Good water quality, a varied diet, and adequate tank size are the biggest factors in reaching the upper end of that range.

    Can pink-tailed chalceus be kept in a planted tank?

    Yes, but with some caveats. They may nibble on softer-leaved plants, so stick with tough species like Java fern, Anubias, and Vallisneria. Floating plants are particularly useful for providing surface cover and making the fish feel more secure. Keep the center and upper portions of the tank open for swimming since a heavily planted tank with dense mid-level vegetation will frustrate these active swimmers.

    What It Is Actually Like Living With Pink-Tailed Chalceus

    Pink-tailed chalceus are active, fast swimmers that patrol the tank constantly. Their speed and power are immediately apparent.

    The pink-red tail catches light beautifully and creates a flash of color as the fish moves through the tank.

    Feeding time is dramatic. They strike food with explosive speed that demonstrates why they are successful predators.

    They have more personality than their simple appearance suggests. Individual fish develop distinct behaviors and routines.

    How the Pink-Tailed Chalceus Compares to Similar Species

    If you’re considering a Pink-Tailed Chalceus, you’ve probably also looked at the Buenos Aires Tetra. Both fill similar roles, but the differences matter when planning your tank. The Pink-Tailed Chalceus has its own distinct personality and care needs. In my experience, the choice often comes down to the specific community you’re building and whether your water parameters favor one over the other.

    The Silver Dollar Fish is worth considering as well. While the Pink-Tailed Chalceus and the Silver Dollar Fish share some overlap in care, they bring different energy to a tank. If you have the space, keeping both in separate setups gives you a great chance to compare their behavior firsthand.

    Closing Thoughts

    The pink-tailed chalceus is a spectacular fish for the right keeper. Those massive reflective scales and that vivid pink-red tail make it one of the most eye-catching large characins you can keep in a home aquarium. It’s not a beginner fish, and it demands respect in terms of tank size, a secure lid, and appropriate tank mates. But if you’ve got the space and the experience to house one properly, it’s a display fish that will turn heads for a decade or more.

    Looking for more large characin care guides? Check out our complete collection of species profiles on our Tetras hub page.

    Have you kept a pink-tailed chalceus? I’d love to hear about your setup and experience. Drop a comment below!

    The fish that tests your lid before it tests your patience.

    Check out our tetra tier list video where we rank the most popular tetras in the hobby, including the pink-tailed chalceus:

    References

  • Green Fire Tetra Care Guide: Tank Setup, Diet, Tank Mates & More

    Green Fire Tetra Care Guide: Tank Setup, Diet, Tank Mates & More

    Table of Contents

    The green fire tetra combines an iridescent green body with red-orange fins in a small, peaceful package. It needs a school of 8+ and slightly acidic water to show its best colors. In hard, alkaline water, the green fades and the red dulls. This is another tetra where water chemistry makes or breaks the display.

    Green fire tetras in the right water are stunning. In the wrong water, they are forgettable.

    The Reality of Keeping Green Fire Tetra

    Water chemistry is everything. The iridescent green only appears in soft, acidic water with tannins. Hard, alkaline water produces a dull, silver-gray fish with no green at all. If you cannot provide the right water chemistry, this is not the fish for you.

    The orange belly glow is the hidden feature. Most guides focus on the green. But well-kept green fire tetras also develop a warm orange glow on the belly that creates the “fire” part of the name. This only appears in fish kept in ideal conditions for extended periods.

    Subdued lighting is essential. Bright lights wash out the iridescence completely. Subdued to moderate lighting allows the green to shimmer and shift as the fish moves. This is a fish for dimly lit, tannin-stained setups, not bright, clean tanks.

    Biggest Mistake New Owners Make

    Keeping them in hard water under bright lights on white gravel. This combination produces a plain silver fish with no green and no fire. Every visual feature depends on the opposite conditions.

    Expert Take

    The green fire tetra is a remarkable fish in the right setup. A blackwater tank with tannins, soft water, and dim lighting transforms it into something that looks almost bioluminescent. The effort required to create those conditions is what separates good keepers from everyone else.

    Key Takeaways

    • Minimum tank size is 15 gallons (57 liters) for a school of 8+ fish
    • Exceptionally hardy – tolerates temperatures as low as 64°F (18°C) and a pH range of 5.5 to 8.0
    • Omnivore – readily accepts flake, frozen, and live foods with no fuss
    • Great beginner fish – one of the most adaptable and forgiving tetras in the hobby
    • Stunning dual coloration – iridescent green body with fiery red-orange belly and fin bases that intensifies with good care
    Map showing the Amazon River Basin in South America
    Map by Kmusser, CC BY-SA 3.0, via Wikimedia Commons

    Species Overview

    Field Details
    Scientific Name Aphyocharax rathbuni
    Common Names Green Fire Tetra, Redflank Bloodfin
    Family Acestrorhamphidae
    Origin Paraguay River basin – Argentina, Paraguay, Brazil
    Care Level Easy
    Temperament Peaceful
    Diet Omnivore
    Tank Level Mid to Top
    Maximum Size 1.6 inches (4 cm)
    Minimum Tank Size 15 gallons (57 liters)
    Temperature 64-82°F (18-28°C)
    pH 5.5-8.0
    Hardness 2-20 dGH
    Lifespan 3-5 years in captivity
    Breeding Egg scatterer
    Breeding Difficulty Easy
    Compatibility Community
    OK for Planted Tanks? Yes

    Classification

    Taxonomic Level Classification
    Order Characiformes
    Family Acestrorhamphidae (reclassified from Characidae per Melo et al. 2024)
    Genus Aphyocharax
    Species A. Rathbuni (Eigenmann, 1907)

    The genus Aphyocharax contains roughly 11 recognized species of small, slender characins found across South American river systems. This group was historically placed within the family Characidae, but a 2024 phylogenomic study by Melo and colleagues reclassified Aphyocharax and related genera into the family Acestrorhamphidae. You may still see Characidae listed in older references, but the updated classification reflects more accurate evolutionary relationships.

    The Green Fire Tetra’s closest well-known relative is the Bloodfin Tetra (Aphyocharax anisitsi), which shares the same genus and many of the same hardiness traits. The species was originally described by Eigenmann in 1907 from specimens collected in the Paraguay River drainage.

    Origin & Natural Habitat

    Map of the Paraguay River basin in South America, native range of the Green Fire Tetra
    Map of the Paraguay River basin, native range of the Green Fire Tetra. Image by Kmusser, CC BY-SA 3.0, via Wikimedia Commons.

    The Green Fire Tetra is native to the Paraguay River basin in South America, with its range spanning portions of Argentina, Paraguay, and southern Brazil. This is a large subtropical river system that feeds into the Rio de la Plata, and it’s home to a huge diversity of small characins.

    In the wild, Green Fire Tetras inhabit slower-moving tributaries, small streams, and marshy areas along the edges of the main river channels. These habitats typically feature sandy or muddy substrates with plenty of submerged vegetation, fallen branches, and leaf litter. The water conditions vary widely across their range, from soft and slightly acidic in forest-shaded tributaries to harder, more alkaline water in open floodplain areas.

    The subtropical climate of the Paraguay basin means significant seasonal temperature swings, with cooler conditions during the southern winter. This natural exposure to fluctuating temperatures is why the Green Fire Tetra handles cooler water so well in captivity. In the wild, they share their habitat with other Aphyocharax species, various corydoras catfish, and other small characins that thrive in these seasonally variable conditions.

    Appearance & Identification

    The Green Fire Tetra is a small, slender-bodied tetra with a color combination that’s unlike anything else commonly available in the hobby. The upper half of the body is covered in an iridescent green sheen that shifts and glows as the fish moves through the water. The lower half, from the belly down through the anal and pelvic fin bases, is washed in a warm red-orange to fiery red color. It’s this contrast between the cool green and the hot red that earns the species its common name.

    The body shape is elongated and slightly compressed laterally, typical of the Aphyocharax genus. The fins are mostly clear to slightly tinted, with the most color concentrated at the bases of the anal and pelvic fins. Under good conditions, the green iridescence is genuinely electric, while the red tones deepen and spread. Stressed or newly acquired fish often look pale and washed out, so don’t judge them by their pet store appearance. Give them a few weeks in a good setup and the transformation is significant.

    Male vs. Female

    Males are slimmer, more streamlined, and show more vivid coloration, particularly in the red-orange tones along the belly and fin bases. Like their Bloodfin Tetra relatives, mature males develop tiny hook-like structures on the anal and pelvic fin rays. These hooks will sometimes be felt if you run a fine net over the fish, as they snag on the mesh. Females are slightly fuller-bodied, especially when carrying eggs, and their coloration is a bit more subdued.

    Average Size & Lifespan

    Adult Green Fire Tetras reach about 1.6 inches (4 cm) in total length. They’re on the smaller side as tetras go, similar in size to neons and cardinals but with that distinctively slender Aphyocharax body shape that makes them look a bit more streamlined.

    In captivity, expect a lifespan of 3 to 5 years with proper care. Consistent water quality, a varied diet, and a stress-free environment with an adequate school size are the main factors in reaching the upper end of that range. Wild-caught specimens may arrive in slightly better condition than mass-produced farm stock, but either way these are fish that reward good husbandry with longevity.

    Care Guide

    Tank Size

    A 15-gallon (57 liter) tank is the minimum for a school of Green Fire Tetras. These are active, mid-to-upper level swimmers that need room to cruise, so horizontal swimming space matters more than tank height. A 20-gallon long (76 liters) is ideal if you want to keep a larger school of 10 or more, which is where you’ll really see their best schooling behavior.

    Like most Aphyocharax species, Green Fire Tetras are capable jumpers. A tight-fitting lid or cover glass is a must. They’re not as bad as hatchetfish, but a startled fish or one chased by a tank mate will find the gap in your cover if it exists.

    Water Parameters

    Parameter Ideal Range
    Temperature 64-82°F (18-28°C)
    pH 5.5-8.0
    Hardness 2-20 dGH
    KH 2-12 dKH

    The water parameter flexibility on this species is outstanding. A pH range of 5.5 to 8.0 and hardness from 2 to 20 dGH means the Green Fire Tetra will adapt to virtually any tap water in the country. You don’t need RO water, peat filtration, or buffering products. Whatever comes out of your faucet, these fish will handle it.

    The temperature tolerance is equally impressive. They handle everything from 64°F (18°C) to 82°F (28°C), making them one of the few tetras that genuinely thrives in an unheated tank. In a climate-controlled home where room temperature sits around 68-72°F (20-22°C), these fish will do perfectly well without a heater. That said, if you’re keeping them in a heated community tank at 76-78°F (24-26°C), they’ll be happy there too.

    Filtration & Water Flow

    Green Fire Tetras handle moderate water flow without issues. They’re active swimmers that can hold their own in gentle to moderate currents. A standard hang-on-back filter works well for smaller setups, while a canister filter is a better choice for tanks 30 gallons (114 liters) and up. Sponge filters are also fine, especially for smaller or breeding setups.

    Aim for weekly water changes of 20-25% to maintain consistent water quality. Despite their hardiness, they’ll show their best coloration and longest lifespan when water conditions stay stable. Consistency matters more than hitting a specific number.

    Lighting

    Moderate lighting brings out the best in Green Fire Tetras. Their iridescent green scales really pop under standard aquarium lighting, and the red-orange tones along the belly contrast beautifully against a well-lit planted tank. They’re not as light-sensitive as some deeper-bodied tetras, but providing some shaded areas with floating plants gives them spots to retreat to and mimics their natural habitat.

    Plants & Decorations

    A planted tank is the best way to showcase Green Fire Tetras. Hardy, low-maintenance plants like Java Fern, Anubias, Amazon Swords, and Vallisneria work well and complement the fish’s coloration. Green Fire Tetras leave plants completely alone, so you don’t need to worry about nibbling or uprooting.

    Plant densely along the back and sides of the tank, leaving open swimming space in the front and center. Driftwood pieces add a natural look, and floating plants like Amazon Frogbit or Dwarf Water Lettuce provide overhead cover that these fish appreciate. Since they spend most of their time in the mid-to-upper water column, focus decorations on creating a balanced mix of open areas and plant cover at those levels.

    Substrate

    Any substrate works since Green Fire Tetras rarely interact with the bottom. Fine sand or smooth gravel are both suitable. A dark-colored substrate is strongly recommended because it makes the green iridescence and red-orange belly tones stand out dramatically. On a light substrate, the colors look significantly washed out by comparison.

    Is the Green Fire Tetra Right for You?

    Before you buy, run through this honest checklist. The Green Fire Tetra is a great fish for the right keeper, but it is not for everyone.

    • You can provide soft, slightly acidic water with tannins for best color expression
    • You have a planted tank with dark substrate and subdued to moderate lighting
    • You keep a school of 8+ for confident behavior and color display
    • You want a tetra that transforms from ordinary to stunning with the right setup
    • You have a 15-gallon or larger tank with stable water parameters
    • You are willing to put in the effort on water chemistry that this species rewards

    Tank Mates

    Green Fire Tetras are peaceful, active community fish that occupy the middle to upper water column. They pair well with a wide variety of similarly-sized peaceful species. Keeping them in schools of 8 or more is important, as smaller groups can lead to scattered, skittish behavior.

    Best Tank Mates

    • Corydoras catfish – peaceful bottom dwellers that occupy a completely different tank zone
    • Bloodfin Tetras – close relatives from the same genus with similar care requirements and cold tolerance
    • Cherry Barbs – peaceful, similarly sized, and add warm red tones that complement the Green Fire’s coloration
    • Harlequin Rasboras – calm mid-level schoolers that won’t compete for space
    • Ember Tetras – small and peaceful with contrasting warm orange coloration
    • Bristlenose Plecos – peaceful algae eaters that stay out of the way
    • White Cloud Mountain Minnows – another cold-tolerant species, perfect for an unheated tank pairing
    • Zebra Danios – active, cold-tolerant, and equally hardy
    • Kuhli Loaches – peaceful bottom dwellers from a completely different zone
    • Dwarf Gouramis – calm upper-level fish that coexist peacefully

    Tank Mates to Avoid

    • Large Cichlids – anything big enough to view a Green Fire Tetra as food
    • Tiger Barbs – notorious fin nippers that will harass smaller tetras
    • Angelfish – adults may prey on small tetras, especially slender ones like the Green Fire
    • Aggressive or territorial species – anything that will chase or corner these active swimmers
    • Very large tank mates – fish significantly bigger than 4 inches (10 cm) can intimidate and stress small tetras into hiding

    Food & Diet

    Green Fire Tetras are unfussy omnivores that accept just about anything you offer. In the wild, they feed on small insects, worms, crustaceans, and whatever organic matter drifts by. In the aquarium, duplicating that variety is easy and rewarding.

    A high-quality flake food or micro pellet serves as a solid daily staple. Supplement 2-3 times per week with frozen or live foods like bloodworms, daphnia, brine shrimp, and cyclops. These protein-rich additions make a noticeable difference in bringing out the red and green coloration.

    Feeding frequency: Once or twice daily, only what the school can consume in about 2 minutes. Green Fire Tetras are mid-to-upper column feeders, so they’ll grab food at or near the surface quickly. If you’re keeping bottom dwellers like corydoras, make sure sinking foods reach the substrate separately.

    Pro tip: Rotating between 3-4 different food types throughout the week produces the most vibrant coloration. The green iridescence and red belly tones respond noticeably to high-quality, varied nutrition. Don’t rely on flake alone if you want these fish to really shine.

    Breeding & Reproduction

    Green Fire Tetras are egg scatterers that breed relatively easily in a home aquarium. Like their Bloodfin relatives, they’re prolific spawners when properly conditioned, making them a solid choice for hobbyists looking to try their hand at breeding small tetras.

    Breeding Difficulty

    Easy. Green Fire Tetras are among the more straightforward tetras to breed. They don’t require extreme water parameters, and they spawn willingly with basic conditioning. The main challenge is protecting the eggs from the adults.

    Spawning Tank Setup

    Set up a dedicated breeding tank of 10 gallons (38 liters). Add clumps of fine-leaved plants like Java Moss or spawning mops to give eggs somewhere to land. A bare bottom with a layer of glass marbles or a mesh screen works well too, since the goal is to prevent the adults from eating the eggs immediately after spawning. Keep a gentle sponge filter running for water movement and biological filtration. Dim the lighting or cover the sides of the tank to create a more subdued environment.

    Water Conditions for Breeding

    Breeding water doesn’t need to be drastically different from normal care parameters. A temperature around 75-79°F (24-26°C), pH of 6.5-7.0, and hardness of 4-8 dGH provides ideal conditions. Slightly softer, warmer water compared to their normal range will trigger spawning behavior. Using aged or slightly acidic water helps, but these aren’t fish that require peat filtration or extreme softness to breed.

    Conditioning & Spawning

    Separate males and females for 1-2 weeks and feed heavily with live or frozen foods. Daphnia, brine shrimp, and bloodworms are excellent conditioners. When females are visibly plump with eggs and males are displaying their most intense coloration, introduce a breeding group (3 males and 3 females works well) to the spawning tank in the evening.

    Spawning typically occurs the following morning, often at first light. The fish scatter adhesive and non-adhesive eggs among the plants or over the substrate. A well-conditioned female can produce several hundred eggs per spawning session. The spawning act involves the male driving alongside the female with rapid fluttering movements.

    Egg & Fry Care

    Remove the adults immediately after spawning, as they will eat every egg they can find. Eggs hatch in approximately 24-36 hours depending on temperature. The fry become free-swimming about 3-4 days after hatching.

    Feed infusoria or liquid fry food for the first 5-7 days, then graduate to microworms and freshly hatched baby brine shrimp as the fry grow. Keep the tank dimly lit during the early stages, as bright light can stress newly hatched fry. Growth is steady with consistent feeding, and juveniles start showing color within a few weeks.

    Green Fire Tetras in the trade come from a mix of captive-bred farm stock and wild-caught specimens. Their willingness to breed in captivity makes them a sustainable choice for the hobby.

    Common Health Issues

    Green Fire Tetras are hardy fish that rarely develop health problems when kept in clean, stable conditions. That said, no fish is completely immune, and here are the issues to keep on your radar:

    Ich (White Spot Disease)

    The most common freshwater fish ailment. Green Fire Tetras can pick up ich after temperature swings or the stress of being introduced to a new tank. Look for the telltale white salt-grain spots on the body and fins. Gradually raise the temperature to 82°F (28°C) and treat with a standard ich medication. These fish tolerate treatment well.

    Fin Rot

    Bacterial fin rot can show up if water quality declines. Frayed, discolored, or receding fin edges are the early warning signs. Improving water quality through more frequent water changes is often enough to reverse mild cases. For more advanced infections, an antibiotic treatment will be needed.

    General Prevention

    Quarantine all new fish for at least two weeks before adding them to your main tank. Maintain consistent water parameters with regular weekly water changes. A varied diet supports a strong immune system, which is your best defense against most common diseases. The Green Fire Tetra’s natural hardiness works in your favor here, but consistent care still matters.

    Common Mistakes to Avoid

    • Keeping too few – Groups under 6 result in stressed, pale fish that scatter around the tank rather than schooling. Aim for 8 or more to see natural behavior and the best coloration.
    • Judging them by pet store appearance – Green Fire Tetras often look washed out and unremarkable in store tanks. They need time to settle in and color up. Don’t pass on them based on how they look under harsh fluorescent lights in a bare tank.
    • Using light-colored substrate – A light or white substrate washes out their coloration significantly. Dark substrate makes an enormous difference in how vibrant the green and red tones appear.
    • Skipping the lid – Like other Aphyocharax species, Green Fire Tetras can and will jump. A secure cover is essential.

    Where to Buy

    Green Fire Tetras are becoming more widely available, though they’re not as commonly stocked as neons or cardinals at big-box pet stores. Your best bet for finding healthy, well-conditioned specimens is through online specialty retailers that focus on freshwater tropical fish.

    Check availability at these trusted retailers:

    Your local fish store also be able to special-order them through their wholesaler if they don’t carry them regularly. Prices are typically in line with other uncommon but not rare tetras. Both wild-caught and captive-bred stock circulate in the trade.

    Frequently Asked Questions

    How many Green Fire Tetras should be kept together?

    A minimum of 6, but 8 to 10 is much better. Green Fire Tetras are active schooling fish that display their best color and most natural behavior in larger groups. In small numbers, they will scatter and look stressed rather than forming a cohesive school.

    What size tank does a Green Fire Tetra need?

    A 15-gallon (57 liter) tank is the minimum for a school of 8. They’re active swimmers that need horizontal space, so a longer tank is better than a tall one. For larger schools or mixed community setups, 20 gallons (76 liters) or more is ideal.

    Are Green Fire Tetras easy to care for?

    Yes. They’re one of the hardiest tetras available. With a pH tolerance of 5.5 to 8.0, a temperature range of 64-82°F (18-28°C), and an unfussy appetite, they adapt to almost any freshwater setup. They’re an excellent choice for beginners.

    Can Green Fire Tetras live in unheated tanks?

    Yes. Green Fire Tetras are subtropical fish that tolerate temperatures down to 64°F (18°C). In a climate-controlled home where room temperature stays around 68-72°F (20-22°C), they do perfectly well without a heater. Pair them with other cold-tolerant species like White Cloud Mountain Minnows or Zebra Danios for an unheated community setup.

    How long do Green Fire Tetras live?

    Expect 3 to 5 years in captivity with proper care. Consistent water quality, a varied diet, and a stress-free environment in an adequate school are the biggest factors in reaching the upper end of that range.

    Can Green Fire Tetras live with shrimp?

    Adult shrimp like Amano Shrimp are safe with Green Fire Tetras. However, smaller dwarf shrimp species like Cherry Shrimp may be at risk, particularly juveniles and shrimplets. If you’re breeding shrimp, provide plenty of dense plant cover like Java Moss for the shrimp to hide in.

    Are Green Fire Tetras fin nippers?

    Green Fire Tetras are peaceful and not known as persistent fin nippers. They’re less nippy than their Bloodfin relatives. However, keeping them in a proper school of 8 or more reduces any minor nipping tendencies by directing social behavior within the group.

    What It Is Actually Like Living With Green Fire Tetra

    In the right setup, green fire tetras shimmer with an iridescence that shifts between green and blue as they move. The effect is subtle and mesmerizing.

    The orange belly glow develops over weeks in ideal conditions and adds a warm counterpoint to the cool green iridescence.

    They are calm, peaceful swimmers that pair beautifully with other soft water species like green neon tetras, pencilfish, and corydoras.

    The transformation from store appearance to home tank appearance is one of the most dramatic of any common tetra.

    How the Green Fire Tetra Compares to Similar Species

    Green Fire Tetra vs. Ember Tetra

    The Ember Tetra has more consistent, reliable coloring in a wider range of conditions. The Green Fire Tetra needs specific water chemistry to show its best. For most setups, the Ember is more satisfying. For a dedicated blackwater or tannin-stained tank, the Green Fire Tetra rewards the effort.

    Green Fire Tetra vs. Green Neon Tetra

    Both have green iridescence, but the Green Neon Tetra has a more consistent neon stripe. The Green Fire Tetra has the added orange belly glow in ideal conditions. The Green Neon is smaller and better for nano tanks. The Green Fire Tetra needs slightly more space and better water chemistry.

    Closing Thoughts

    The Green Fire Tetra is a genuinely underrated species that checks almost every box. It’s hardy, peaceful, beautiful, adaptable to nearly any water conditions, and even works in unheated setups. The combination of iridescent green and fiery red-orange is unique in the tetra world, and a school of 10 or more in a planted tank with dark substrate is a sight worth building a setup around.

    If you’re exploring other hardy tetras with similar care requirements, check out our guides for Bloodfin Tetras, Buenos Aires Tetras, and Flame Tetras.

    Have you kept Green Fire Tetras? I’d love to hear about your experience with them. Drop a comment below!

    Check out our tetra tier list video where we rank the most popular tetras in the hobby, including the Green Fire Tetra:

    References

    • Froese, R. And D. Pauly, Eds. FishBase. Aphyocharax rathbuni. Accessed 2025.
    • SeriouslyFish. Aphyocharax rathbuni species profile. Accessed 2025.
    • The Aquarium Wiki. Aphyocharax rathbuni. Accessed 2025.
    • Melo, B.F, et al. (2024). Phylogenomics of Characidae. Zoological Journal of the Linnean Society, 202(1), 1-37.

    The Green Fire Tetra is just one of dozens of tetra species we cover in our complete species directory. Whether you’re looking for classic community tetras or unusual specialty species, our guide has you covered.

    👉 Tetras: Complete A-Z Species Directory

  • 9 Types of Geophagus: My Guide to Earth Eaters After Years in the Aquarium Trade

    9 Types of Geophagus: My Guide to Earth Eaters After Years in the Aquarium Trade

    I’ve spent years working in local fish stores, and Geophagus are some of the most fascinating cichlids I’ve had the pleasure of caring for. What sets them apart is their feeding behavior. they scoop up mouthfuls of sand and sift it through their gills, extracting food particles before expelling the substrate. It’s mesmerizing to watch, and one of the main reasons hobbyists fall in love with this group. In this guide, I cover 9 of the most commonly available Geophagus species and everything you need to keep them healthy and thriving.

    Key Takeaways

    • Geophagus are large to medium-sized South American cichlid fishes
    • These fish are relatively peaceful and can be kept with a variety of tank mates. However, they may become aggressive when spawning
    • Earth eaters require a relatively large aquarium (75 gallons+) and should be kept on a sandy substrate
    • Identifying Geophagus can be tricky, so it’s best to buy from reputable breeders and sellers who can provide accurate information

    Types Of Geophagus – 9 Beautiful Species

    1. Altifrons

    geophagus-altifrons
    All photos courtesy of aquariumphoto.dk with their permission
    • Origin: Amazon River Basin in Brazil
    • Maximum size: Can reach over 10 inches
    • Recommended temperature range: 79-89ยฐF
    • pH: 5-7

    Characterized by the lack of vertical bars on its colorful body, Geophagus altifrons often have a pair of small spots on each flank. This species has a deep body shape with a steeply sloping forehead and develops long trailing tips on each fin, including paired caudal extensions.

    G. altifrons are among the most popular eartheater species in the aquarium hobby, although they require a relatively large aquarium for long-term care. This species is one of the larger South American eartheaters and a small group will need a tank of over 100 gallons.

    2. Brasiliensis

    geophagus-brasiliensis
    • Common name: Pearl cichlid
    • Origin: Southeastern Brazil, Paraguay, and Uruguay
    • Maximum size: Males up to about 11 inches and females up to 6 inches
    • Recommended temperature range: 65-82ยฐF
    • pH: 6-8

    Also known as the pearl cichlid, Geophagus brasiliensis is a beautiful freshwater fish characterized by an oval body shape and a dark vertical stripe through each eye. This species also has reddish fins, bright blue spots, and dark markings on its sides.

    Geophagus brasiliensis has similar colors to other members of its genus although its body shape and habits are rather different. They will feed from the bottom, although they do not filter the substrate as often as other earth-eating cichlids.

    3. Winemilleri

    geophagus-winemilleri
    • Origin: Venezuela
    • Maximum size: 8 inches
    • Recommended temperature range: 65-82ยฐF
    • pH: 4-7

    Geophagus winemilleri is a rare but particularly colorful species that can be identified by a dark spot on the lower jaw and long trailing tips and white edges to their red fins.

    They have a series of broad and pale vertical bands on each side and the neon blue markings on their flanks are arranged in horizontal stripes rather than speckles, making this species particularly striking.

    4. Sveni

    geophagus-sveni
    • Origin: Brazil
    • Maximum size: 7 inches
    • Recommended temperature range: 76-84ยฐF
    • pH: 6-7.5

    Geophagus sveni really pops with neon blue and can be distinguished from other earth-eating cichlid fish by the five pale vertical bars on its side and the lack of face markings. This colorful species also has a large blue spot on either side of its body and its tail is covered in glowing blue speckles often arranged in vertical columns.

    G. sveni is a common species, that is suitable for moderately experienced aquarists.

    5. Pellegrini

    geophagus-pellegrini
    • Common name: Yellowhump eartheater
    • Origin: Colombia
    • Maximum size: 6 inches
    • Recommended temperature range: 77-86ยฐF
    • pH: 5-6

    G. pellegrini stands out with its yellowish coloration with dark vertical bars, shallow body shape, and pointed face. Males also develop a prominent hump on the top of the head, which explains why the species is commonly known as the yellowhump eartheater.

    This species is at home in shallow, fast-flowing streams with various substrate types, although it will do well over a sandy substrate in the home aquarium.

    6. Surinamensis

    geophagus-surinamensis
    • Common name: Red striped eartheater
    • Origin: Suriname and French Guiana
    • Maximum size: 12 inches
    • Recommended temperature range: 72-77ยฐF
    • pH: 6-8

    Geophagus surinamensis is a large eartheater with a very restricted distribution range in the northeast of South America.

    Many mislabeled eartheaters are sold as Geophagus surinamensis, although this species is actually pretty rare in the hobby and rarely imported. Many of these fish are likely to be other species like Geophagus abalios or similar species.

    I saw this constantly working in fish stores. fish labeled as Geophagus surinamensis that were almost certainly a different species entirely. True surinamensis are genuinely rare in the trade. If you’re specifically trying to source this species, buy from a reputable breeder who can confirm the collection locality rather than trusting a general store label.

    7. ‘Pindare’

    geophagus-pindare
    • Origin: Brazil
    • Maximum size: 6 inches
    • Recommended temperature range: 79-84ยฐF
    • pH: 6-7

    Geophagus sp. ‘Pindare’ is a relatively small eartheater that reaches about 6 inches in length. This species is identified by its large eye, short and deep body, and a large spot on either flank.

    Geophagus sp. ‘Pindare’ is a relatively peaceful species, although it can become rather aggressive when spawning like other cichlid fishes from the genus Geophagus. The species is known from rivers and can be housed in a tank with moderate water flow and a fine sandy substrate that matches its natural habitat.

    8. Redhead Tapajos

    geophagus-pyrocephalus
    • Origin: Rio Tapajos, Brazil
    • Maximum size: 8 inches
    • Recommended temperature range: 79-86ยฐF
    • pH: 4.5-7.5

    Properly known as Geophagus pyrocephalus, the Geophagus sp ‘Tapajos Red Head’ is a small, peaceful eartheater from the Rio Tapajos, a tributary of the Amazon River.

    It is one of the most colorful and popular eartheaters, and as its name suggests, this fish has a bright red/orange forehead. The species also has neon-striped pelvic, anal, and caudal fins. The red head tapajos is a good first species for Geophagus beginners.

    This is my personal pick for anyone new to Geophagus. The Redhead Tapajos is smaller and more manageable than many of the larger species in this genus, its bright red forehead makes it one of the most visually striking earth eaters available, and it tends to be more forgiving of typical hobbyist conditions. If you’re looking for a starting point with this group, start here.

    9. Acarichthys heckelii

    acarichthys-heckelii
    • Common name: Threadfin Acara
    • Origin: Peru, Colombia, and Brazil
    • Maximum size: 8 inches
    • Recommended temperature range: 76-86ยฐF
    • pH: 6-8

    Despite the obvious similarities, the threadfin acara is not classified as a true Geophagus species. They may belong to distinct lineages, but these earth-eating cichlids share the same habit of digging through the substrate and should ideally be kept over a bed of fine sand.

    Threadfins have a beautiful pearly color and blueish fins with long trailing fin extensions in adult specimens. An albino form is also available in the aquarium trade for fish keepers who want a really striking specimen.

    These fish are generally peaceful towards other fish species, although they can be aggressive toward their own kind or other cichlids with a similar appearance.

    Other Popular Earth Eater Species

    satanoperca-jurupari

    The following earth-eating cichlid species are also known from the aquarium trade:

    • Geophagus dicrozoster – Dichrozoster eartheater
    • G steindachneri – Redhump eartheater
    • Satanoperca jurupari – Demon eartheater
    • Biotodoma cupido – Cupid cichlid
    • Guianacara sp. – Bandit cichlid
    • Gymnogeophagus balzani – Paraguay eartheater

    What Are They?

    Geophagus is a genus of over 30 South American fish species in the Cichlidae family. These fish are commonly known as ‘eartheaters’, although various other genera are typically included in the eartheater group1.

    Geophagus are medium to large freshwater fish that inhabit a wide variety of habitats ranging from relatively still tropical waters to cool, fast-flowing rivers and tributaries. They are restricted to South America where they occur in many countries, including Brazil, Colombia, Venezuela, and Paraguay.

    What’s in a Name?

    The word geophagus means earth-eater and it’s a pretty accurate description of their feeding technique. These fish take mouthfuls of the substrate to sift out food particles before spitting all the sand and inedible material back out or passing it out through their gills. Pretty interesting!

    Identifying Geos

    These fish are pretty difficult to identify to a species level if you don’t know exactly which river system they were collected from. However, you can identify them by careful examination of the spots on their gill plates, markings on their flanks, and spots/stripes on their fins.

    I’ve added some key identifying features in each species profile to help you tell them apart, but it’s a good idea to buy these fish from knowledgeable sellers if you want to be sure.

    Keeping Eartheaters – Tank Setup

    Tank Size

    Geophagus are popular aquarium species that are fairly easy to maintain in captivity. However, their requirements vary from species to species, so it’s important to tailor your tank to the needs of each type.

    These are medium to large freshwater fish, ranging from about 6 to 12 inches in length. While some species can be housed in tanks as small as 55 gallons, most will do better in tanks in the 6-foot range.

    From my experience, a 4-foot tank is the absolute minimum I’d recommend for most Geophagus species. These fish need room to establish loose territories without constant conflict, and footprint matters far more than tank height. If you can manage a 6-foot tank for a small group, you’ll see much more natural behavior and far less stress.

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    Tank Layout

    When it comes to decor, a simple scape, including some decorative driftwood and a sandy substrate, is considered ideal. Fishkeepers who plan to breed these fish should include some flat rocks to encourage spawning.

    This is non-negotiable. The biggest mistake I see with Geophagus is the wrong substrate. gravel or coarse rock will damage their delicate gill rakers over time as they try to sift it. This is a fish that has evolved specifically to move fine sand. Without it, Geophagus can’t express their natural feeding behavior, and their health will suffer. Fine-grained sand first, everything else second.

    Live plants are not essential, although epiphytes and robust plants like Amazon sword will create a natural habitat and help to improve water quality by reducing nitrates.

    Unfortunately, the sand-sifting feeding behavior of Geophagus cichlids makes them unsuitable for more heavily planted aquariums or tanks with carefully arranged hardscapes.

    Heating and Filtration

    Most species from the Geophagus genus prefer warm, tropical temperatures, often exceeding 80 degrees Fahrenheit. Most aquarists will require a heater to maintain these temperatures.

    Excellent filtration and regular maintenance are necessary to provide the high water quality these fish require. Their habit of stirring up the substrate while feeding will release particles into the water column, so good mechanical filtration is vital.

    Many species inhabit flowing water, so good water flow and aeration are important. A powerful filter may be adequate or you can look at adding a powerhead and an airstone to create a more suitable environment.

    Maintenance and Care

    Water Quality and Maintenance

    High water quality is essential for keeping healthy eartheaters, so be prepared to perform regular maintenance every week. Ideally, you should perform large water changes of at least 50% each week, especially in smaller or more heavily stocked aquariums.

    Feeding

    Geophagus have evolved to sift through sand to find their food, although you will need to feed them regularly in the home aquarium.

    It’s best to feed these cichlids a quality sinking pellet, although acclimated specimens may learn to take flake food. You can also supplement their diet with frozen foods like bloodworm and brine shrimp or plant matter like blanched vegetables and spirulina.

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    Tank Mates

    Geophagus temperaments vary depending on species and individual personalities. Generally speaking, they are social fish that do best when kept with their own kind, so pick up a group instead of a single fish.

    Geos can be kept with a variety of tank mates, although their companions should enjoy the same conditions and water parameters. Popular options include other South American cichlids like electric blue acaras and smaller community fish like corydoras catfish and larger tetras.

    Geophagus cichlids do not usually eat other fish, although it does happen from time to time. Avoid any very small, slow-moving tank mates that your eartheaters may be able to catch and swallow whole.

    Breeding Earth Eaters

    Geophagus can be bred in the home aquarium, although it is best to keep a breeding pair in their own tank to avoid aggression and protect the fry from predation.

    These fish are mouthbrooding cichlids that make great parents. Some species incubate their eggs in their mouths while others collect the newly hatched fry. In both cases, the parents protect the young until they are old enough to fend for themselves.

    The breeding tank should have gentle filtration, a thick layer of sand, and a few flat rocks where the female will lay her eggs. Once the fry have absorbed their yolk sacs, they can be fed a suitable micro food like baby brine shrimp and finely crushed flake foods.

    How many Geophagus species are there?

    There are about 32 described species of freshwater fishes in the genus Geophagus. These fish are separated into the following three species groups according to their distribution in the wild:

    Geophagus steindachneri group
    Geophagus brasiliensis group
    Geophagus sensu stricto group

    What is the most beautiful Geophagus?

    Geophagus cichlids are among the most colorful and attractive freshwater fish in the aquarium hobby. Opinions differ between fishkeepers, although the red head Tapajos and Geophagus altifrons are strong contenders!

    What is the largest Geophagus?

    The largest eartheater cichlids grow to about 12 inches (30cm) in length and have a pretty fast growth rate. Geophagus altifrons, G. brasiliensis, and G surinamensis are among the largest species in the genus.

    What is the smaller species of Geophagus?

    Geophagus sp. ‘Pindare’ and G. parnaibae are among the smallest species in the genus. These small cichlids reach a maximum size of approximately 6 inches (15cm). The red head tapajos is also relatively small at up to 8 inches (20cm).

    What is the most peaceful Geophagus?

    Most Geophagus cichlids are relatively peaceful fish, although they can be aggressive when breeding. G sveni and G. pyrocephalus (red head Tapajos) are among the most peaceful species, although it’s important to note that each fish has its own personality, and some will behave more aggressively than others.

    How many Geophagus should be kept together?

    Most Geophagus cichlids are shoaling fish that should be kept in groups of 5 or more. However, G. brasiliensis tends to be more aggressive so it is suggested to keep just one specimen and avoid similar-looking fish.

    Final Thoughts

    The earth-eating cichlids from the Geophagus genus are some of the most stunning aquarium fish in the hobby and a great choice for any aquarist with enough space to house a small group. These fish bring amazing colors and interesting antics to any display tank, although they do require excellent water quality and plenty of open sandy substrate to perform their natural feeding behaviors.

    Do you keep Geophagus cichlids in your tanks? Share your favorite species in the comment section!

    ๐Ÿ“˜ Want to learn more? This article is part of our complete Freshwater Fish Guide. your ultimate resource for freshwater species, care tips, tank setup, and more.

  • Cichlid Tank Mates: My Guide to What Actually Works After 25 Years

    Cichlid Tank Mates: My Guide to What Actually Works After 25 Years

    I’ve kept Mbunas alongside tiger barbs, rainbow sharks, and pictus catfish. and made it work. But that required a properly sized tank, deliberate stocking order, and plenty of territory. Cichlid tank mates aren’t something you pick at random; success comes down to space, water parameters, and knowing your specific cichlid’s temperament. In this guide I break down the best tank mate options for African, Central American, and South American cichlids based on real experience.

    Key Takeaways

    • Contrary to popular belief, cichlids can have tank mates!
    • There are three main types of cichlid: African cichlids, Central American cichlids, and South American cichlids.
    • Aggression varies from species to species and tank mate pairings will greatly depend upon compatibility with other fish, along with water parameters and tank setup.
    • African cichlids have the least flexibility in terms of tank mates while South American species have some of the greatest.

    Understanding What Type You Have

    First, you need to determine what type of cichlid you have. All cichlids are capable of being aggressive, but some can be kept in community tank setups while others can only be kept with members of their own kind.

    Luckily, most aquarium stores accurately name their cichlids so you don’t need to wonder what kind you’re taking home. Here are some of the most common cichlids you’ll find.

    African Cichlids

    Yellow Lab

    African cichlids mainly originate from two freshwater lakes in Africa: Lake Malawi1 and Lake Tanganyika. Lake Malawi cichlids, including Mbuna cichlids, tend to be more colorful but more aggressive than Lake Tanganyika species.

    Lake Malawi cichlids include:

    • Electric yellow cichlid (Labidochromis caeruleus). These fish grow to 5-7 inches and are bright yellow with black-trimmed fins.
    • Demasoni cichlid (Pseudotropheus demasoni). Demasoni cichlids reach mature sizes between 3-5 inches and thrive in groups. They have alternating black and blue stripes.
    • Aulonocara spp. Commonly known as the Lake Malawi peacock cichlids, members of the Aulonocara genus come in reds, blues, and yellows, and grow to about 4-6 inches.

    Lake Tanganyika cichlids include:

    • Frontosa (Cyphotilapia frontosa). Frontosa cichlids are easily recognized by their alternating black and blue stripes and prominent foreheads. They grow to about 8-10 inches.
    • Lemon cichlid (Neolamprologus leleupi). These fish are bright yellow and grow to about 5 inches in length.
    • Golden Julie cichlid (Julidochromis ornatus). The golden Julie stays between 3-4 inches at mature size and features a mottled black, yellow, and white pattern.

    Other popular African cichlids include:

    • Kribensis (Pelvicachromis pulcher)
    • Jewel Cichlid (Hemichromis bimaculatus)
    • African Butterfly Cichlid (Anomalochromis thomasi)

    Central and South American Cichlids

    Cichlids are found throughout Central and South America, with many species originating from the Amazon River. Central American species are considered to be more aggressive than their South American counterparts, but this will vary from species to species.

    Convict-Cichlid

    In comparison to African cichlids, these fish are much less aggressive. In fact, some can be kept in a community tank setup given the right environment.

    Here are some of the most popular Central American cichlids:

    • Red devil (Amphilophus labiatus). The red devil is named after its pale-red coloration and aggressive temperament. These fish reach a maximum size of about a foot.
    • Convict cichlid (Amatitlania nigrofasciata). Growing to 3-5 inches, the convict cichlid is named after its alternating black and white stripes.
    • Jack Dempsey (Rocio octofasciata). The Jack Dempsey reaches mature size at about 10 inches in length. These fish have bluish-green coloration with iridescent spots.

    South American cichlids are some of the recognizable fish in the aquarium hobby, like the freshwater angelfish, though most keepers don’t even know that they’re cichlids! Here’s a list of a few you might recognize:

    • Green terror (Andinoacara rivulatus). A beautiful fish, the green terror is a very aggressive cichlid. These fish are electric blue, yellow, and orange, and can grow up to a foot in length.
    • Ram cichlid (Mikrogeophagus ramirezi). One of the most community-friendly cichlids, the ram cichlid can be easily bred in the home aquarium. These blue, yellow, and red fish stay relatively small, usually under 4 inches.
    • Angelfish (Pterophyllum scalare). An odd-looking cichlid, the freshwater angelfish is a type of South American cichlid! Angels come in a variety of natural blacks, browns, and silvers, and can reach a height of 12 inches.
    • Discus (Symphysodon spp.). Considered to be one of the most challenging cichlid tank setups to maintain, discus come in all colors. They grow to be about 6-10 inches and can be bred in the home aquarium.
    • Severum (Heros severus/Heros efasciatus). Another relatively peaceful fish, the severum comes in a variety of colors, ranging from very bright to dull. They reach mature size between 6-8 inches.

    Best Tank Mates

    As you can see, there are many different species of cichlid! Even though they’re all related to the Cichlidae family, most of these fish cannot be kept with one another. Instead, cichlid tank mates are very limited. In most cases, species can only be kept with their own species. In some of the more niche African cichlid communities, fish can only be kept with other fish from their exact natural habitat.

    When picking cichlid tank mates, aggression needs to be considered first, but tank size and setup need to be considered as well. For example, African cichlids originate from much more basic and harder water parameters than the low acidity and softness found throughout South America. While cichlids aren’t overly active fish, they need a lot of space to create territories.

    This is the single most important rule for cichlid tank mates: don’t attempt it in a small tank. A 55-gallon is the minimum for most African cichlid setups, and even then stocking order is critical. The bigger the tank, the more territory gets distributed and the less any one fish dominates. Combinations that fall apart in a 55-gallon often work fine in a 75 or 90-gallon.

    The biggest mistake I see is hobbyists ignoring water parameter differences. African cichlids need hard, alkaline water. South American community fish like tetras and corydoras prefer soft, acidic conditions. Mix those together and even if the aggression doesn’t kill anything, the wrong parameters will stress every fish in the tank. Know your cichlid’s water chemistry requirements before picking any tank mate.

    With all this considered, here are some of the best tank mates for African, Central American, and South American cichlids.

    African Cichlids

    There are many species of cichlid across the continent of Africa. In most cases, fish that originate from the same region can be kept together. Even then, there is room for aggression.

    Let’s first consider the best tank mates for Lake Malawi species.

    Lake Malawi tank mates

    Lake Malawi African cichlids are considered to be more aggressive than Lake Tanganyika species, so tank mate pairing and ordering are especially important.

    Mbuna

    Mbuna species. Members of the Labidochromis, Pseudotropheus, and Melanochromis genera do best when kept together. These are colorful fish that can be mixed and matched in a 55 gallon aquarium. It is recommended to keep about 10 individuals per 55 gallon, paying extra attention to the stocking order.

    Mbuna cichlids need plenty of rock in their aquarium to set up territories. The most aggressive species should be added last to prevent competition.

    From personal experience: tiger barbs, rainbow sharks, and pictus catfish can all hold their own in a well-set-up Mbuna tank. Tiger barbs are fast and assertive enough to avoid becoming targets. Rainbow sharks are naturally territorial. they stake out their own section and cichlids tend to respect it. Pictus catfish are quick, nocturnal, and generally left alone. None of these are guaranteed, but with a large tank and plenty of rockwork, these combinations can work.

    Aulonocara species. Peacocks are considered to be less aggressive than Mbuna species, but they’re still aggressive cichlids. In most cases, they can’t withstand the aggression of Mbunas, making these two species incompatible tank mates. Instead, peacock cichlids can be kept with each other, and more docile haps (Haplochormis spp.).

    These fish also depend on the rockwork to form territories, so it’s important to incorporate plenty of caves and hiding spots for the fish. Aulonocara and Haplochormis have comparable aggression levels, but this may vary between specific species. Fish may be added together if they’re the same size, or be added later on according to size.

    Lake Tanganyika tank mates

    While Lake Tanganyika African cichlids are generally less aggressive than those from Lake Malawi, special attention is still needed to create successful tank mate pairings.

    Shell-dwellers. There are a few different species of shell-dweller, including those from the Neolamprologus and Lamprologus genera. These freshwater fish defend their shell territories at the bottom of the tank, so tank mates should stay in the upper portions of the tank. Aggression can vary from species to species, but some tank mate options include:

    • Sardine cichlid (Cyprichromis leptosoma)
    • Julidochromis spp.
    • Neolamprologus brichardi
    Frontosa-Cichlid

    Frontosas. These are some of the more peaceful fish on this African cichlid list, but they’re still capable of harassing and eating other fish. Frontosas do well in a species-only aquarium but can be kept with a few other Lake Tanganyika species, like the lemon cichlid or Judiochromis transcriptus. Some cichlid enthusiasts have even had luck keeping frontosas with shell-dwellers if the tank is set up with both species in mind.

    Julidochromis spp.. Species from this genera can be kept with a few different African cichlids. Along with shell-dwellers and frontosas, Julidochromis could potentially be paired with sardine cichlids and Neolamprologus species.

    Other African cichlid tank mates

    In general, African cichlids should only be kept with related species. These are some of the most aggressive fish available in the hobby, and any fish tank mate pairing can fail. Because of this, hobbyists usually only recommend Synodontis catfish for these aggressive cichlid species.

    Synodontis catfish (Synodontis spp.).These are nocturnal fish, which can help decrease the possibility of aggression. Some species only grow to be 4 inches, so they should not be kept with larger cichlids. They originate from Lake Tanganyika and do best with other endemic species, like frontosas and members of both Neolamprologus and Julidochromis. Popular species include S. lucipinnis, S. angelicus, and S. eupterus.

    Synodontis-Catfish

    Given a large tank with plenty of hiding spots, Syndontis have also been successfully kept with Mbunas and Aulonocara peacocks.

    Synodontis and pictus catfish are two of my personal top picks for African cichlid tanks. Both are fast, tough, and occupy different parts of the water column than most cichlids. exactly what you want. They’re not pushovers, and that matters in an African cichlid setup.

    Rainbowfish (Melanotaeniidae family). Some hobbyists add rainbowfish, like Boesemani (Melanotaenia boesemani), to their African cichlid tank setups. These smaller, fast-moving fish act as dither fish which can help diffuse overall aggression.

    Central and South American Cichlids

    If you want a little more wiggle room for cichlid tank mates, Central and South American species are generally much more peaceful than their African counterparts. For some of these cichlids, it’s still recommended to only keep other species from Central and South America.

    Aggressive tank mates

    Central and South American cichlids can greatly vary in size and aggression. Species like red devils and green terrors are large freshwater fish. Even if a given species is not aggressive, they will readily eat smaller fish.

    Here are some of the best tank mates for large and/or aggressive Central and South American cichlids:

    Giant gouramis (Osphronemus goramy). Giant gouramis need a giant tank. They reach impressive sizes and can become increasingly aggressive as they grow. While native to Southeast Asia, these fish can be kept in a cichlid tank with oscars, severums, and geophagus.

    Catfish. Most species of catfish can be kept with both peaceful and aggressive cichlids. An aggressive Central and South American cichlid tank can house Synodontis catfish, Raphael catfish (Platydoras armatulus), Redtail catfish (Phractocephalus hemioliopterus), and Pictus catfish (Pimelodus pictus).

    Keep in mind that some catfish, like the redtail catfish, can grow to extreme sizes.

    Arowana (Osteoglossidae family). Arowanas are one of the largest fish available in the aquarium trade, but they’re relatively delicate. It is not unheard of for especially aggressive species to chase after and attack arowana. Unfortunately, arowanas can quickly succumb to injury. In return, large arowanas also have the potential to eat smaller, calmer cichlids. In some cases, this pairing can work.

    Arowana-Fish

    Other cichlids. The best cichlid pairings are ones that stay true to what you would find in their natural environment. Pick species that naturally occur in the same regions as your desired cichlid. Set up the tank so that each fish has its niche within that space. While this still isn’t guaranteed to work, it’s one of the best ways to approach any cichlid aquarium setup.

    Community tank mates

    It’s always risky adding more peaceful fish to a cichlid tank, but some hobbyists have made it work. These pairings will largely depend on the temperament of your freshwater fish, but success can be increased by providing plenty of hiding spots and paying close attention to interactions. Luckily, these species are usually much more peaceful than African cichlids, so there are some choices!

    Rainbowfish

    Here are some common community tank species that might fit in a Central or South American cichlid setup. Note any cichlid larger than 8 inches may consume them:

    Giant danios (Devario aequipinnatus). Giant danios are possible tank mates for cichlids: they’re big, fast, and stay at the top of the water, away from predators. This doesn’t make them an instant success, however. Many hobbyists have found that their giant danio numbers start to dwindle the longer they stay in the tank. Make sure to watch out for aggression and be ready to rehome fish if necessary.

    Rainbowfish. Species like the Boesemani rainbowfish (Melanotaenia boesemani), millennium rainbowfish (Glossolepis pseudoincisus), and the turquoise rainbowfish (Melanotaenia lacustris) have been known to make good tank mates for certain cichlids. Rainbows need to be kept in groups of at least 6 or more but are generally capable of escaping an attacking cichlid.

    Swordtails (Xiphophorus hellerii). If you have cichlids that mind their own business, then swordtails could help bring some color and movement to the top of the aquarium. These fish are colorful and busy, but most importantly, they’re prolific. This is especially helpful as even if a cichlid goes after adults or eats the majority of fry, chances are that a swordtail population will be able to sustain itself.

    Congo tetras (Phenacogrammus interruptus). Another similar option is the Congo tetra. These are moderately-sized schooling fish, just big enough to hold their own against a more territorial cichlid. Congo tetras are one of the few species of tetra that can be housed with cichlids, as anything smaller could be bullied or eaten.

    Peaceful Cichlid Tank Mates

    Some cichlids simply get along with fish while others are actually peaceful species. So much so that some hobbyists don’t even realize they’re cichlids, like freshwater angelfish! While African cichlids are still too aggressive to make this list, there are plenty of other Central and South American species that can successfully be added to a community tank.

    Rams

    The ram cichlid is a small South American species that can be kept and bred within a community tank setup. These fish only grow to about 4 inches, which means that they can be kept with both bigger and smaller species.

    Some compatible ram cichlid tank mates include:

    It’s important to note that ram cichlids prefer slightly higher water temperatures than normal, in the 78 to 85ยฐ F range. Tank mates should be able to adapt to these conditions without any ill effects.

    Angelfish

    Zebra-Angelfish

    Freshwater angelfish are arguably the most popular species of cichlid, though many hobbyists don’t even realize that they’re cichlids. These fish require some special care when choosing tank mates as they prefer slow-moving water conditions and cannot tolerate having their fins nipped.

    These are some options to consider:

    • Other angelfish
    • Mollies
    • Rainbowfish
    • Corydoras catfish
    • Molly Fish
    • Certain tetras (Cardinal tetras, Rummynose tetras)

    Discus

    Red-Turquoise-Discus

    Discus are one of the more challenging species of aquarium fish to keep due to their need for near-pristine water parameters and higher water temperature ranges. Because of this, many hobbyists choose to keep discus in setups by themselves, but some have also had luck keeping them in community tanks.

    Some suitable tank mates might be:

    Oscars

    Albino-Oscar

    Oscars can be aggressive, but they don’t mean to be. Instead, these are gentle giants that need plenty of space for themselves and might mistake smaller fish for a meal. Given the right setup, they are very easy to care for and can be kept with a variety of species, including:

    • Silver dollars
    • Clown loaches
    • Arowanas
    • Other cichlids (Green terror, Jack Dempsey, Severums)
    • Other oscars

    Severums

    Severum-Cichlid-Fish

    Severums are another relatively peaceful species of cichlid. These are large fish, growing to nearly 10 inches at adult size, but they can bring a lot of color and interest to a semi-aggressive community tank. They need a large tank, but can be kept with an assortment of:

    • Silver dollars
    • Denison barbs
    • Pearl gouramis
    • Oscars
    • Other severums

    FAQS

    What kind of fish can be put with cichlids?

    African cichlids have limited tank mates while Central and South American species can be kept with a bigger assortment. In general, African cichlids should only be kept with species that originate from the same regions. Central and South American species have greater flexibility for being mixed with each other and with other aquarium species.

    Can you put a cichlid in a community tank?

    Yes! Some cichlids can be kept in a community aquarium setting, like rams, angelfish, and discus. This means that they can be kept with more familiar tetras, cory catfish, and livebearers. However, more aggressive types, like African cichlids, should only be kept with each other.

    Do cichlids eat other fish?

    Yes, cichlids, especially large ones, can eat other fish. This isn’t entirely on purpose for some species, like the oscar, where curiosity gets the best of them. It is always safe to assume that if a fish can fit in another fish’s mouth, they could potentially become lunch.

    African cichlids and more aggressive South American cichlids are more likely to chase and attack fish than they are to mistakingly eat them.

    Can cichlids live with goldfish?

    No! Cichlids can never live with goldfish. Goldfish are coldwater fish while cichlids prefer tropical and above tropical water temperature conditions. Many African cichlid species also prefer harder and more basic water conditions, which is incompatible with goldfish. Lastly, goldfish are gentle and relaxed while cichlids are active and territorial!

    Conclusion

    When setting up a cichlid tank, you need a plan. These are aggressive fish that have special considerations regarding water parameters, tank setup, and aggression. Tank mates will largely revolve around the type of cichlid you choose to keep. An African cichlid tank might only leave room for related species but an angelfish aquarium might allow space for a variety of community species.

    Keep in mind that while one pairing works for another hobbyist it might not always work for you. Always be ready to rehome fish if necessary.

    ๐Ÿ“˜ Want to learn more? This article is part of our complete Freshwater Fish Guide. your ultimate resource for freshwater species, care tips, tank setup, and more.

  • Why Angelfish and Guppies Are a Deadly Combo: What I’ve Seen After 25 Years

    Why Angelfish and Guppies Are a Deadly Combo: What I’ve Seen After 25 Years

    Angelfish and guppies look like an easy pairing on paper. both are tropical, both are popular, and their water parameters overlap enough that it seems to make sense. But I’ve seen this combination go wrong many times. Once angelfish start breeding, they become a completely different fish. The guppies that were swimming around unbothered suddenly become targets. and often end up as a meal. In this article I explain exactly why these two species don’t mix, and what to keep with your angels instead.

    Key Takeaways

    • Angelfish and guppies are two beginner species that are incompatible with each other.
    • Guppies like active, neutral conditions while angelfish thrive in stagnant, acidic environments.
    • Angelfish can grow to moderate sizes and will eat smaller fish and fry.
    • Some of the best tank mates for angelfish are tetras, rainbowfish, and other cichlids.

    Intro To Angelfish

    Before we can understand why guppies are incompatible with angelfish, we need to understand angel requirements on their own. These fish have been in the aquarium hobby for a long time, and the understanding of their care has changed throughout the decades.

    Zebra-Angelfish

    Angelfish are a type of tropical cichlid. The most common species to find in the aquarium hobby is Pterophyllum scalare, but you may find others available in more specialized fish stores. These fish originate from the Amazon River system throughout South America, specifically from parts of Brazil, Colombia, and Peru. They are found in slow-moving waters, dense with vegetation. They prefer more acidic conditions, closer to blackwater environments.

    Luckily, most angelfish available for sale have been commercially bred, which led to more ethical sourcing and better-controlled health. There are also many varieties of angelfish available, but most display plain colors of browns, blacks, and silvers. At adult size, they can grow to be 6 inches long and 8 inches tall. Some individuals even grow to an impressive 1 foot in height!

    Tank Setup

    There has always been a lot of discussion surrounding angelfish tank size. They aren’t overly active fish, but they can grow to considerable sizes and exhibit some aggressive behavior. Because of this, the current recommendation is a 40 gallon for keeping them with multiple angels or other fish species, and a 20 gallon for a pair. Because of their height, they are one of the few fish that do better in a tall aquarium than a long one.

    This aquarium should have minimal water flow with plenty of plants and organics that lower the water pH.

    Behavior

    As a cichlid, these fish are mildly aggressive. They are not fast swimmers and will stick to the middle and upper portions of the water column. Male angels are likely to establish territories throughout the tank, especially during breeding periods. Females can be just as aggressive as males in some cases.

    This is the part most people don’t anticipate. An angelfish that ignored guppies for months can turn predatory the moment it starts breeding. I’ve seen it happen. guppies that coexisted fine suddenly start disappearing once the angels pair off and claim territory. Breeding flips a switch in them, and small, fast-moving fish like guppies become threats to be chased or food to be eaten.

    As slow swimmers, they are also slow eaters. This behavior is especially important to keep in mind when picking other tank mates as a shy angel could be outcompeted.

    One last thing to consider is that, while semi-aggressive fish, angelfish can be skittish. Because of this, many hobbyists keep their angelfish aquariums dimly lit and stained with tannins.

    Intro to Guppies

    A guppy fish is likely to be one of the first tropical fish you ever get. These are small, hardy fish that bring a ton of color and excitement to the aquarium. They’re very forgiving of incorrect water parameters and will continue to breed regardless. All this, in addition to their wide availability and affordable price, make them a perfect beginner fish1.

    Blue Grass Guppy

    That’s the problem, though: guppy fish are perfect beginner fish. What happens when you want to move on to more advanced species, like the angelfish? Can you keep guppies and angels in the same tank?

    In most cases, guppy fish cannot be safely kept with angelfish. It might be hard to understand why, as these fish have many overlapping requirements, but we’ll see what makes these two fish species incompatible in the long run.

    Mature Size

    Guppy fish are small fish with males staying under 1.5 inches and females maxing out at around 2.5 inches. While this makes it so that a lot can be kept in a little, these tiny fish also make an enticing snack for larger angelfish.

    Though unlikely, any fish is capable of eating something that can fit in their mouths. Small guppies, as well as guppy fry, are a quick and easy snack for a mature angelfish.

    Tank Setup

    Guppies can pretty much be kept in any aquarium setup imaginable, but the same cannot be said for angels. As mentioned before, angelfish prefer near-blackwater conditions in dim lighting conditions. While the two species enjoy an abundance of live plants, their compatibility in terms of tank setup ends there.

    Guppy fish are often kept in neutral water parameters, with a pH near 7.0. While they can be acclimated to more acidic conditions, it’s best to keep fish close to their original environments. This is also true for the amount of water flow present in the fish tank. Guppies enjoy swimming against a current, whereas angels will be pushed into the corner by nearly any trace of water movement.

    Another important aspect to keep in mind is that guppies are prolific breeders. The more space and resources they have, the more they will reproduce. In general, guppy fish can comfortably live in a 10 gallon aquarium. At one point or another, adult and/or baby guppies will need to be removed to maintain a healthy balance in the aquarium.

    Aqueon 10 Gallon Tank
    Aqueon 10 Gallon Tank

    Your standard 10 gallon tank. Goes on sale at local Petcos for cheap

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    If placed in a very large tank, removing excess guppy fry can be difficult, even though your angelfish will likely help maintain populations. As we’ll see, an increase in guppies can lead to numerous problems for the angels in regard to opposing behaviors.

    Behavior

    On paper, it would seem that you could keep guppies and angelfish together. But when kept together in the same aquarium, these fish couldn’t be any more different.

    Angelfish might as well have the exact opposite behavior as guppies. Angels are slow-moving and relatively reserved. Guppies are front-and-center and constantly moving! While this pairing of behaviors might work for other fish species, it does not work for these.

    Green-Guppy

    Guppies are simply too overbearing for angels. They stay in the same portions of the aquarium as angels and can stress angelfish out. Keep in mind that just because your angelfish is supposed to be semi-aggressive does not mean that you can’t get a shy one. This is especially true during feeding times when angelfish like to take their time and eat while guppies go into a frenzy. This incompatibility can lead to overly aggressive or starved angels.

    Angelfish are a much more reserved, observational fish. I’ve watched angels in high-activity tanks stop coming to the surface to eat and start retreating into corners. An angelfish that stops eating is already in trouble. The constant movement and surface activity of guppies is genuinely stressful for a fish that prefers slow, dimly lit, plant-heavy conditions.

    While guppies aren’t aggressive fish, they have been known to be fin nippers. If an angelfish spends a significant amount of time in the upper water column, they may start to get bullied by the other guppies. This can be damaging as angelfish are already prone to snagging their extended finnage and developing fin rot. Similarly, an aggressive angel might chase and nip at pesky guppies that invade their territory.

    While it might seem like guppies and angelfish can go in the same tank, the differences in their behaviors ultimately make them incompatible.

    Why Angelfish and Guppies Don’t Work

    Can you put guppies and angelfish together? No.

    While these fish are two of the most popular fish species available, they cannot be kept in the same aquarium. This is because:

    1. Guppies are small, peaceful fish that can quickly become food for a larger angel. Guppy fry will also be regularly consumed by hungry angelfish.
    2. Angelfish prefer water parameters that resemble their natural habitat. This is slow-moving water with low pH. Guppy fish can be acclimated to a lower pH, but prefer a moving water current with near-neutral water quality. Angelfish also prefer dim settings while guppies shine under bright lights.
    3. Guppies can quickly overrun a larger fish tank as they are prolific breeders. A healthy balance between guppies and angels may be difficult to maintain while keeping parameters in check.
    4. Guppy fish and angelfish have opposite behaviors. Angels are large semi-aggressive fish that can bully smaller fish, or be bullied if the individual is shy. This is especially true during feeding times when guppies are quick to eat.

    Better Alternatives

    Though guppies and angelfish might not work together, there are plenty of ways to still use both of these species in their own respective community tank setup.

    Some of the best guppy fish tank mates include:

    Depending on the individual personality of your angel, you may be able to set up a community aquarium. If you have an angelfish that shows territorial behavior, then you may need to include some of the more aggressive species. Unfortunately, there is no way to tell how angelfish will react to new fish, so you might need to rehome tank mates if things don’t work out. To help avoid this, it’s recommended to add other fish to the tank before adding the angels.

    From my experience, rainbowfish and Congo tetras are two of the best alternatives. both are large enough that angels won’t see them as prey, and both are active without being overbearing. For more advanced aquarists, discus are an excellent pairing with angelfish; they share the same slow-water, warm, slightly acidic preferences and have a similar calm temperament. Just be prepared for the water quality demands discus require.

    Some community tank mate options for angelfish include:

    If you have angels that display territorial behavior, then you might consider these tank mates instead:

    In order to keep a group of angelfish together indefinitely, fish should be added to the aquarium at the same time. At least 5 or more can comfortably be kept in a mid-size tank as long as there is a balance of males and females.

    Can different species of angelfish be kept together in the same tank?

    As mentioned before, there are a couple of different species of angelfish available in the aquarium hobby. One of these includes the relatively rare–and expensive–altum angelfish (Pterophyllum altum).

    For the most part, hobbyists agree that these two species can be tank mates as long as a large tank is allowed. It is also recommended to add the two species together to help diffuse any possible aggression. A rehoming plan should be used in case the pairing doesn’t work out.

    Which fish can be kept with angelfish?

    Angelfish can be kept with certain tetras, gouramis, severums, or acaras. They cannot be kept with guppies and generally don’t do well with any species of livebearer.

    What fish are compatible with guppies?

    Angelfish can be kept in pairs with each other, in a community tank setup, or in a semi-aggressive setup. Depending on the plan you have for your tank, you may want to try breeding angels. Otherwise, your angel’s personality will decide whether you keep a community aquarium or a more predatory fish setup.

    How many angel fish should be kept together?

    Angelfish can be kept in pairs of two or in small groups of 5 or more. This will be determined by the size of your aquarium and the temperament of your fish.

    Do angelfish eat other fish?

    Angelfish have small mouths, but they will likely try to eat smaller tank mates. They will especially love trying to catch baby guppies!

    Can you put angelfish with mollies?

    While you can’t really keep guppies and angelfish together, do mollies work?

    Many of the same concerns arise with mollies as when keeping angelfish with guppies: natural habitat differences, and opposing behaviors. However, mollies are considerably bigger than guppies and slightly less active. Full-grown angelfish will still see smaller mollies as snacks, but the two species are slightly more likely to be compatible tank mates in the long run.

    Conclusion

    Guppies and angelfish are two of the most popular beginner fish species available, but unfortunately, they do not make good tank mates. There are simply too many differences between preferred water conditions and behaviors that make it likely for either your angels or guppies to get hurt in the process. Depending on the personality of your angelfish, other suitable tank mates might be tetras, gouramis, corydoras, or other cichlids.

    ๐Ÿ“˜ Want to learn more? This article is part of our complete Freshwater Fish Guide. your ultimate resource for freshwater species, care tips, tank setup, and more.

  • Best Beginner Tropical Fish: My 11 Picks After 25 Years of Fishkeeping

    Best Beginner Tropical Fish: My 11 Picks After 25 Years of Fishkeeping

    I’ve been keeping tropical fish for over 25 years, and choosing the right beginner fish is something I feel strongly about. Most people walk into a pet store, pick something colorful, and end up with incompatible fish or species that outgrow their tank within a year. After keeping hundreds of species across freshwater setups. from 5-gallon betta tanks to 125-gallon community builds. I’ve put together this list of 11 fish I’d genuinely recommend to any first-time fish keeper.

    Key Takeaways

    • The best tropical fish for beginners are small, peaceful species that can adapt to various water conditions and store-bought foods.
    • Tropical fish require warm, filtered water for long-term care. Select a filter and heater suitable for your tank size.
    • Measure your local water parameters before selecting your first fish. This will help you choose fish that will suit your conditions.
    • Read up on the aquarium cycle and water quality maintenance before buying your first fish. It’s generally safer for first-time fish keepers to cycle their aquarium before adding fish.

    Best Beginner Tropical Fish

    1. Livebearers

    Sunset-Platy
    • Scientific name: Poecilia and Xiphophorus spp.
    • Origin: North, Central, and South America
    • Size: 1 – 6 inches
    • Minimum tank size: 10 gallons for guppies and Endler’s, 20+ gallons for swordtails and molly fish
    • Temperament: Generally peaceful
    • Swimming level: All levels
    • pH: Most species prefer pH levels above 7
    • Temperature: Upper 60’s to upper 70’s Fahrenheit
    • Key benefits: Affordable, colorful, easy to breed

    Livebearers are a great first-fish because they are so affordable and easy to care for. These fish are also available in a wide variety of colors, from jet-black molly fish to fiery red variable platies and multicolored fancy guppies, so you can choose literally any color you like!

    Of all the livebearers, my personal preference is platies. Guppies and mollies have been so heavily overbred that many store-bought specimens are weaker and more disease-prone than they should be. Platies have held up much better. they’re genuinely hardier, healthier, and still come in a great range of colors. If you’re choosing a livebearer for your first tank, start with platies.

    Several differnet species from the same family are available in the hobby, including:

    • Guppy fish (Poecilia reticulata)
    • Endler’s livebearer (Poecilia wingei)
    • Platy fish (Xiphophorus maculatus & X. variatus)
    • Molly fish (Poecilia sphenops & P. latipinna)
    • Swordtail fish (Xiphophorus hellerii).

    All of these tropical fish are members of the Poeciliidae, a family known for producing live baby fry rather than laying eggs. This makes livebearers very easy to breed, even for complete beginners. However, you could keep only males if you don’t want your fish to multiply1.

    Live-bearing fish are generally very easy to care for and will thrive on a diet of small pellets or flake food. Some species will even feed on algae and help to keep their own tank clean!

    2. Betta

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    Betta Fish
    Betta Fish

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    Betta Fish are one of the most beautiful varieties of freshwater fish available in the hobby. Easy to care for with plenty of varieties!

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    • Scientific name: Betta splendens
    • Origin: Thailand
    • Size: 2- 2.5 inches
    • Minimum tank size: 5+ gallons
    • Temperament: Aggressive
    • Swimming level: Middle and upper levels
    • pH: 6.5-8
    • Temperature: 76-81ยฐF
    • Key benefits: Spectacular colors and fins, thrives in tanks as small as 5 gallons

    The betta fish is one of the most popular fish in the hobby due to their beauty and feisty personality. The combination of amazing colors and impressive flowing fins make these small fish excellent display animals for small aquariums.

    Bettas are suitable for some community tanks, although they are usually kept alone in their own tank. These fish don’t need a lot of room, and it’s possible to keep them happy and healthy in a tank as small as 5 gallons. However, you will need to perform regular water changes and equip your aquarium with an aquarium heater and a suitable filter.

    One strong recommendation if you’re buying a betta: look for a Plakat (short-fin betta). Long-finned varieties are beautiful, but their fins are so heavy they can barely swim and they’re prone to fin rot. Plakats are what bettas look like in the wild. they swim powerfully, tend to be healthier, and are noticeably more active fish. Many hobbyists who switch to Plakats never go back to long-finned varieties.

    3. Danios

    <a href=Glowlight Danio Near Gravel” class=”wp-image-557066″/>
    • Scientific name: Danio rerio
    • Origin: Asia
    • Size: 2-2.5 inches
    • Minimum tank size: gallons
    • Temperament: Peaceful
    • Swimming level: All levels
    • pH: 6.5-7
    • Temperature: 72-81ยฐF
    • Key benefits: Hardy, affordable, and active. Various breeds available

    There are many danio species in the fishkeeping hobby, and some of them are excellent options for beginners. The popular zebra danio (Danio rerio) is one of the hardiest species and is suitable for larger aquariums in the 20-gallon range.

    Zebra danios usually have a silvery body with dark horizontal stripes. However, there are many different breeds, and the spotted leopard danios and the eye-catching neon Glofish breeds are all the same species.

    These active fish can be kept in tanks as small as 10 gallons, although they will appreciate the extra swimming space of a 20-gallon long. Smaller species like the celestial pearl danio are a little more difficult to care for, although they are suitable for moderately experienced fishkeepers with a planted aquarium.

    4. Corydoras Catfish

    Habrosus Cory Catfish
    Habrosus Cory Catfish

    A small and active cory catfish. Does best in groups of at least 5

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    • Scientific name: Corydoras spp.
    • Origin: South America
    • Size: 1-3 inches
    • Minimum tank size: usually 30+ gallons, although small species can be kept in tanks as small as 10 gallons
    • Temperament: Peaceful
    • Swimming level: Mostly bottom dwellers
    • pH: 6.5-8
    • Temperature: 72-82ยฐF depending on species
    • Key benefits: Peaceful community fish for the bottom levels of tropical aquariums

    There are dozens of corydoras species available in the aquarium hobby, including popular species like the peppered, bronze, albino, and panda cory catfish. These chunky bottom feeders are some of the best tropical fish for community tanks, although they don’t win any prizes for their color.

    Cory catfish prefer to spend their time peacefully searching the substrate for tasty morsels, although they often shoot up to the surface to grab a breath of air. These entertaining fish will hang out in loose schools of their own species, so try to buy a small group of a single type.

    My personal favorite corydoras for beginners is the Sterbai cory. It’s one of the most striking in the family. cream-colored spots on a dark body with orange-tipped pectoral fins. and importantly, it’s a warmer-water species that thrives at the higher temperatures most tropical community tanks run. I’ve kept Sterbai corys across multiple tank setups and they never disappoint.

    5. Honey Gourami

    Honey Gourami
    Honey Gourami

    One of the more peaceful Gourami fish available in the hobby. Has a unique yellow coloration and only grows up to 2 inches in length

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    • Scientific name: Trichogaster chuna
    • Origin: Southern Asia
    • Size: 2-2.5 inches
    • Minimum tank size: 10 gallons
    • Temperament: Peaceful
    • Swimming level: Middle and upper levels
    • pH: 6-8
    • Temperature: 74-82ยฐF
    • Key benefits: Peaceful alternative to betta fish

    The honey gourami is a peaceful labyrinth fish that can be kept with other popular tropical fish like neon tetras, rainbow fish, and many more. These interesting fish have modified pelvic fins that they use like little arms to feel the world around them.

    Honey gouramis aren’t quite as colorful as dwarf gouramis, although they are much better fish for beginners due to their peaceful nature. However, these fish are also available in some great color morphs like the sunset and red breeds.

    Honey gouramis are predators that hunt for small aquatic invertebrates and their larvae, although they are easy to feed in captivity. Provide regular flake food and some tasty treats like frozen blood worms and brine shrimp.

    7. Cherry Barb

    Cherry Barb
    Cherry Barb

    A popular freshwater fish from the barb family. One of the most peaceful barb fish

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    • Scientific name: Puntius titteya
    • Origin: Sri Lanka, South Asia
    • Size: 2 inches
    • Minimum tank size: 15-20 gallons
    • Temperament: Peaceful
    • Swimming level: All levels
    • pH: 6-7.5
    • Temperature: 73-81ยฐF
    • Key benefits: A peaceful and inexpensive schooling barb

    Cherry barbs are peaceful schooling fish that can be kept with other small peaceful fish like white cloud minnows and zebra danios.

    Males develop a beautiful cherry red shade, although females are also attractive, with a rich orange color and a pair of bright and dark horizontal stripes on each side.

    Cherry barbs are omnivorous fish that thrive on small pellets or flake foods, although they will appreciate a varied diet including live or frozen foods like blood worms. These fish love to hang out together so pick up a school of six or more.

    8. Black Neon Tetra

    Black Neon Tetra
    Black Neon Tetra

    A variant neon variety. More reliant than neon and cardinal tetras

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    • Scientific name: Hyphessobrycon herbertaxelrodi
    • Origin: South America
    • Size: 1.5 inches
    • Minimum tank size: 15-20 gallons
    • Temperament: Peaceful
    • Swimming level: Middle and upper levels
    • pH: 5.5-7.5
    • Temperature: 71-82ยฐF
    • Key benefits: One of the hardiest tetras

    Black neon tetras are perfect community fish for beginners, offering great color and a peaceful nature. These midwater swimming fish will thrive in a tropical fish tank with other schooling fish and bottom dwellers like corydoras catfish and the bristlenose pleco.

    Black neon tetras are schooling fish that should be kept in a group of their own species. A 15-gallon tank would be suitable for about 6 fish.

    9. Small Plecos

    Zebra-Pleco
    • Scientific name: Ancistrus spp. etc.
    • Origin: South America
    • Size: 4-6 inches
    • Minimum tank size: 20-30 gallons
    • Temperament: Peaceful
    • Swimming level: Bottom dweller
    • pH: 5.7-7.5
    • Temperature: 73-80ยฐF
    • Key benefits: Fascinating bottom dwellers that can help to control algae in the aquarium

    There are hundreds of pleco species known in the aquarium trade, although small species like the bristlenose pleco are most suitable for beginner fish keepers. These fascinating creatures are very peaceful despite their unusual appearance.

    These gentle catfish will not bother other fish, although they can be a little territorial toward their own kind. That means it’s best to keep just one small pleco species in the same aquarium unless you have a large tank.

    Bristlenose and other small plecos are herbivores that can do a great job of cleaning algae in the aquarium, although you should also provide plenty of driftwood for them to graze on. They will also eat plant food like cucumber, zucchini, sinking algae wafers, and gel foods.

    10. Kuhli Loach

    Kuhli Loach
    Kuhli Loach

    Kuhli Loaches are hardy bottom-dwelling fish. Nocturnal in nature. Gets along with many fish and tolerate of coldwater environments

    Click For Best Price
    • Scientific name: Pangio kuhlii
    • Origin: Southeast Asia
    • Size: 3-4 inches
    • Minimum tank size: 20 gallons
    • Temperament: Peaceful
    • Swimming level: Bottom dweller
    • pH: 5.5-6.5
    • Temperature: 73-86ยฐF
    • Key benefits: Interesting bottom dweller that will clean up uneaten food

    Kuhli loaches are fascinating creatures that look like hyperactive eels as they zoom along the bottom of the tank. However, these small loaches are mostly nocturnal, so they are usually active after the lights go off.

    There are a few species in the hobby including the black kuhli loach which is really more of a chocolate-brown shade. However, the regular banded kuhli loach is one of the most attractive types.

    These fish love to hang out with their own kind, so it’s best to buy five or more and let them explore together. They will burrow under rocks and driftwood or tunnel into the substrate but come out to search for uneaten food and sinking pellets or tablets when they smell food in the water.

    11. Kribensis Cichlid

    Kribensis Cichlid Male and Female
    • Scientific name: Pelvicachromis pulcher
    • Origin: West Africa
    • Size: 3-4 inches
    • Minimum tank size: 20 gallons
    • Temperament: Generally peaceful but can be aggressive when breeding
    • Swimming level: All levels
    • pH: 6-7
    • Temperature: 75-79ยฐF
    • Key benefits: A relatively peaceful and adaptable African cichlid with amazing colors

    The kribensis cichlid is a beautiful dwarf cichlid from West African rivers. These colorful fish do not require the hard, high pH water chemistry of other popular African cichlids, making them a good choice for many community setups or even breeding projects.

    These fish spawn easily, and they are fascinating to breed, although they can get pretty aggressive in the breeding season. Males and females are similar in appearance, although females tend to be shorter and plumper, while males have a more streamlined body shape and longer pointed caudal, anal and dorsal fins.

    Kribensis cichlids are easy to care for and will thrive on regular commercial foods like flakes and pellets. They are generally suitable for larger planted tropical fish tanks with other small, peaceful fish, although they are not shrimp-safe.

    Species to Avoid

    Unfortunately, there are many popular tropical fish that are not really suitable for beginner fish owners. Most pet stores have knowledgeable staff that will point new fishkeepers in the right direction, although sometimes beginners buy fish that are better left to the experts.

    Avoid these fish until you are a little more experienced.

    The most common impulse buy I see beginners make is goldfish. Despite being sold in small tanks at the pet store, fancy goldfish can reach 8. 12 inches and single-tailed varieties can hit 12. 18 inches. They’re cold-water fish that don’t belong in a tropical setup, produce significantly more waste than most species, and need far more filtration than beginners typically run. Goldfish are not beginner fish. they’re a dedicated hobby in themselves.

    Tankbusters

    Tinfoil Barb

    Some popular aquarium fish grow surprisingly large and require very large aquariums when they reach adult size. Avoid these common tank busters until you are more experienced and have room for a much larger tank:

    • Common pleco – grows to over 12 inches
    • Red-tailed catfish – grows to over 5 feet!
    • Bala shark – grows to over 12 inches
    • Clown loach – grows to about 12 inches
    • Tinfoil barb – grows to over 12 inches

    Aggressive Species

    Jaguar Cichlid

    Some aquarium fish are prized for their aggressive behaviors, while others are surprisingly mean and territorial. Aggressive fish can be exciting pets, although they are not recommended for beginners.

    Let’s take a look at some examples.

    • Chinese algae-eater – These fish are known to feed on the slime coat of other fish
    • Red-tailed and rainbow sharks – These fish can be surprisingly aggressive and territorial, especially toward their own kind.
    • Jaguar Cichlid – These large cichlids are extremely aggressive towards other fish and may even bite human hands.
    • Red devil cichlid – Red devils are highly aggressive Central American Cichlids that need large aquariums and tough tank mates.

    Species With Special Water or Care Requirements

    What is a fancy goldfish

    Some freshwater fish breeds and species have specific needs that make them more difficult to care for. The following fish are better for more experienced fish keepers.

    • Fancy goldfish – Goldfish are not tropical fish. These common aquarium fish need cool water conditions and are usually kept in unheated fish tanks.
    • African cichlids – African cichlids from the Rift Valley lakes require high pH water with a high mineral content. Many species are highly territorial too, so these fish are better left to more experienced fishkeepers.
    • Discus – The discus fish requires pristine water conditions to survive. These sensitive fish are not suitable for beginners.

    Why Are Some Species Easier To Keep?

    Candy Koi <a href=Betta Fish” class=”wp-image-543292″/>

    You may be wondering how I chose the fish in this list, or why some fish are better for beginners than others. Well, it really comes down to a few different factors that make them tougher and easier to care for.

    Let’s take a look at five important characteristics of good beginner fish.

    • Hardiness

    The ideal beginner fish are relatively hardy and will usually survive the kind of mistakes inexperienced fish keepers tend to make.

    Many new fish keepers will take some time to figure out how much to feed their fish, or how often to clean their tank or change their water. Basically, hardy beginner fish are much harder to kill.

    • Diet

    Some fish species have very specific diets that are difficult to provide in an aquarium. Fortunately, all the fish in this list will feed on regular commercial foods like flakes, pellets, or wafers.

    However, it’s still important to select the right kinds of foods for your specific fish species. Many small schooling fish will do well on a flake diet, while bottom feeders like corydoras prefer sinking pellets and tablets.

    • Size

    Bigger fish aren’t necesarily more difficult to care for, although small fish in the 1.5-3 inch range make ideal beginner fish because they tend to do well in the smaller aquariums that most fish keepers start out with.

    Aquariums in the 15 to 30-gallon range are generally cheaper and easier for beginners to maintain.

    • Temperament

    Each fish has its own individual temperament, although different species tend to have certain characteristics. Confident but peaceful fish are the ideal species for beginners because they tend to feed well and get along with other species. Aggressive and shy fish may require more experience.

    • Adaptability

    Some fish have very specific requirements when it comes to temperature, water chemistry, flow, and other factors.

    These fish may be easy to care for if you can provide these conditions, but it is usually best to start out with adaptable fish that thrive in the average home aquarium.

    Aquarium Basics – Getting Started

    Waterbox Nano

    Have you chosen your favorite beginner fish? Run through this list of basic equipment and important concepts before you buy your first fish.

    Basic Equipment List

    • Suitable fish tank – A 15-30 gallon is ideal for beginner fish keepers as they are relatively easy to maintain. Avoid bowls or tanks smaller than 5 gallons.
    • Aquarium heater and thermometer – Tropical fish require a suitable heater to create the warm water conditions that match their natural habitat.
    • Aquarium filter – You will need a filter to keep your water clean and clear. An air-powered sponge filter is adequate for a small aquarium, although power filters, hang-on-backs, and canister filters are better for larger aquariums.
    • Substrate and decorations – Use only clean, aquarium safe products in your fish tank.
    • Maintenance equipment – You’ll also need some cleaning and maintenance equipment like a gravel vacuum, water test kit (pH, GH, KH, Ammonia, Nitrite, Nitrate), water conditioner and a bucket.

    Important Concepts for Beginners

    Take the time to learn about the following important concepts before you buy your first fish.

    • Water parameters – Its important to measure your water hardness and pH before buying your fisrt fish. That way you can choose fish that are naturally suited to your water conditions.
    • The Nitrogen Cycle – Excess nutrients from fish waste and uneaten food are processed by special bacteria in a cycled aquarium. Understanding this cycle will make you a better fish keeper and help you maintain a healthy aquarium.
    • Regular Maintenance – Your aquarium will require regular cleaning and partial water changes to remove dirt, algae, and the excess nutrients left behind from the nitrogen cycle. Ideally, the frequency of these water changes should be based on nitrate levels measured with your water test kit.

    Some of these concepts may seem a little tricky at first, but don’t be intimidated by the technical side of the hobby. The Aquarium Store Depot website is full of in-depth articles that will help you keep your tropical fish happy and healthy for years to come!

    FAQs

    What is the easiest tropical fish to keep for beginners?

    Guppies and zebra danios are among the easiest tropical fish in the aquarium hobby. Zebra danios are particularly hardy fish, although they do best in a larger aquarium of 20 gallons or more. Guppies will thrive in a tank of 10-15 gallons with basic care.

    What is the best tropical fish for a new tank?

    Many new fish keepers make the mistake of adding fish to a new tank right away because they are unaware of the aquarium nitrogen cycle. This process can take several weeks, although some aquarists successfully cycle new aquariums with hardy fish like zebra danios.

    What fish to put in tank first?

    Its best to add just a few fish at a time until your biological filtration system is fully accustomed to a high bioload. Hardy schooling fish like zebra danios or black neon tetras are a good first fish, although there is no set sequence when adding fish to an aquarium.

    Final Thoughts

    Choosing your first fish is an exciting step at the start of a wonderful new hobby and hope the information in this guide has helped you choose your next pets! My best advice is to take your time and enjoy the process of learning before buying your first fish.

    Looking for more fishkeeping information? Browse the rest of my in depth articles for more on these and other tropical freshwater fish. You’ll also find loads of other helpful articles on every aspect of tropical fishkeeping!

    ๐Ÿ“˜ Want to learn more? This article is part of our complete Freshwater Fish Guide. your ultimate resource for freshwater species, care tips, tank setup, and more.

    ๐ŸŸ Want to learn more? This article is part of our complete Aquarium Care Guide. your ultimate resource for water chemistry, maintenance, feeding, disease prevention, and everything you need for a healthy tank.

  • Feeder Fish: My Honest Take After 25 Years of Using Them

    Feeder Fish: My Honest Take After 25 Years of Using Them

    Iโ€™ve used feeder fish in my own tanks over the years. mainly feeder guppies and goldfish. and Iโ€™ve formed a pretty clear opinion on them. Guppies are my preference because they breed fast enough that you can maintain your own colony, which cuts out most of the disease risk. That said, my honest recommendation is to treat feeders as a bridge: useful while youโ€™re transitioning a fish onto prepared foods, but not something Iโ€™d rely on long-term. Hereโ€™s what you need to know before using them.

    Key Takeaways

    • Predatory fish can be fed an assortment of feeder fish.
    • Feeder fish can vary in size and quality, so it’s important to buy the right ones for your fish.
    • The best feeder fish are raised in their own aquarium with a high-quality diet.
    • A nutritious feeder fish can be fed once or twice a week depending on the species and the size of the predator.

    What Are Feeder Fish?

    Comet Goldfish

    Feeder fish are any type of fish that has been bred to serve as food for other aquatic life. This can include an array of species, both freshwater and saltwater.

    Feeder fish are often seen in local fish and pet store locations. They are usually kept by the dozens or hundreds in a big, empty tank. These are usually feeder goldfish, guppies, platies, or other tropical livebearers, and are priced at less than $1.00 each.

    Unfortunately, these fish are not kept in the best conditions. They are seen as highly disposable and not worth the cost of upkeep. As a result, infection, disease, and mutations run rampant. This makes it very easy for these same ailments to be added to the home aquarium during feeding times. For this reason, many hobbyists who heavily rely on feeder fish breed their own stock.

    Feeder fish can also be well-fed guppies and platies from a heavily planted display aquarium. Many hobbyists understand that the love and care they give for feeder fish translates into the overall health of their predatory fish. For this reason, many hobbyists with carnivorous fish raise their own feeder fish in regular aquarium conditions. Some even plump their feeder stock up with high-quality foods to ensure that their bigger fish get a nutritious treat.

    Benefits To Live Food

    For years, there has been discussion surrounding the ethics of feeding live fish to aquarium fish. With all the great food options available, some hobbyists don’t see it necessary to offer live food. While we can’t tell you what’s right or wrong, we can give you some of the benefits of feeding live fish.

    Enrichment

    The biggest benefit of offering live fish as food is providing enrichment for other fish. Fish are limited to their tank environment, and they likely get bored every now and then. They might even get tired of having the same thing for dinner every night in a row.

    Offering feeder fish provides a new enrichment element in the tank by making the other fish use their predatory instincts. This can stimulate your fish’s instincts and activity levels.

    Natural Habitat

    A predatory species likely eats other fish in the wild. This isn’t always true as some fish are strictly insectivores, but if your fish can fit another species in its mouth, then it’s likely that they eat fish in their natural habitat.

    Nutrients

    While aquarium foods are usually packed with nutrients, one food can’t cover every single mineral and nutrient. Because of this, most hobbyists have a rotating diet with many different food options. One of these options might be feeder fish.

    If the hobbyist chooses to raise their own feeder fish, then there is even greater control over nutrient intake for both the prey and the predator.

    Sometimes It’s Necessary

    One reason live food might be necessary is that your fish might be wild caught. While many fish have been successfully bred in the aquarium hobby, some are still collected. Unless they are shown how to eat flake or pellet food, they might need to be given a strictly live diet for a while. This is also true if the fish is picky.

    Types

    The most common types of feeder fish to see for sale are goldfish and guppies. Depending on whether you have access to a bait shop or a more specialized store, you might have access to better, and sometimes cheaper, alternatives.

    Here are some of the different options you might come across and how each can be fed!

    Bluegill

    Bluegills are very common North American freshwater fish found in ponds and lakes. They are scientifically known as Lepomis macrochirus and are often sold for freshwater fishing.

    While some hobbyists catch bluegills to keep as aquarium pets (check with state laws as this could be illegal), others use these fish as food for their other pond fish, like bass. These fish may be found for sale in a commercial fishing store, but are most often caught from local waterways. This can introduce parasites and other diseases into the aquarium.

    Another consideration to take into account is that bluegills are large fish that grow up to a foot long. While they are often sold as juveniles under 5 inches, if your fish doesn’t eat, then you might end up with a bluegill tank mate! Bluegills are also relatively aggressive, which could become problematic in the future.

    Goldfish

    Feeder-Goldfish

    Goldfish, Carassius auratus, are arguably the most common feeder fish available as both freshwater and saltwater predators eat them. They are easy to find and usually marked at an extremely low price. However, there are a lot of problems that can come with goldfish.

    As you may know, goldfish are some of the messiest fish in the aquarium hobby. Setting up and maintaining a healthy supply of goldfish can be difficult for the average aquarist. Purchasing live goldfish from the store can also be challenging as disease runs rampant in unclean and unmonitored store tanks.

    The same problem arises from keeping goldfish as bluegills, and that’s that goldfish can grow to extreme sizes depending on the breed. While some breeds stay small, under 4 inches, others can grow to be a couple feet. Unless you know how to identify breeds of goldfish (and not trust what they’re listed as at the store) then you might not know what you’re getting yourself into.

    There is another underlying problem that hobbyists aren’t even aware of: thiaminase. Thiaminase is a necessary enzyme that helps break down vitamin B1 in several species, including goldfish. Though this enzyme is essential for the fish, ingesting large amounts of it can lead to thiamin deficiency in other organisms.

    Guppies

    Guppies Swimming

    Guppies are another popular choice and the term includes some subcategories. These fish often cost even less than goldfish and are just as available. As these fish stay under about 1.5 inches, they can be fed to a variety of tropical fish.

    ๐Ÿ† My pick among feeder fish: Guppies are my preference over feeder goldfish. Theyโ€™re smaller, they breed incredibly fast, and if you raise your own colony in a spare 10-gallon tank at home, you sidestep the biggest disease risk altogether. A healthy home colony can easily keep pace with most predatory fish.

    Commercial feeders suffer from the same poor conditions as goldfish, meaning that disease and infection can easily be transmitted. Many species of guppy also contain thiaminase, which can start to affect the animals being fed after prolonged ingestion.

    Other alternatives to guppies might be:

    • Mosquito Fish (2.8 inches)
    • Minnows (2.5 inches)

    Mosquito fish, minnows, and guppies are often sold alongside each other as feeder fish. You may not even be able to tell them apart when they’re kept in the same poor conditions. Luckily, they are very easy to breed in the home aquarium and can be fed with high-nutrition foods.

    Unfortunately, both of these fish still increase the chances of thiamin deficiency.

    Platies

    Gold-Red-Platy

    Platies are less commonly found as feeder fish, but many aquarists use them in their own homes as they reproduce rapidly. These fish also stay between 2-3 inches, which makes them easy to feed to most moderately-sized fish.

    If you’re going to feed feeder fish, then platies are probably some of the most reliable, as long as you’re breeding your own. These are easy and hardy fish that can easily be fed and prepared for feeding. As of now, platies are also not known to cause thiamin deficiency in other animals1.

    Why Are They Bad?

    While there are definitely benefits to giving feeder fish to predatory species, like enrichment and nutritional value, there are a lot of reasons why you might be hesitant to try. Here are some remarks from esteemed aquarist and scientist Dr. Neale Monks (see his full article at WebWebMedia).

    Disease and Illness

    As already mentioned, most feeder fish from pet stores are diseased. These are cheap fish that are disposable and will not have their tanks properly taken care of. This, in addition to a high turnover rate, makes it a near-guarantee that some ailment or bacteria will unknowingly enter your aquarium during feeding times.

    โš ๏ธ From my experience: Disease management is the #1 issue I warn people about with feeder fish. Store-bought feeders are kept in severely overcrowded tanks with minimal care. the conditions are rough. Iโ€™ve seen ich and bacterial infections introduced this way more than once. If youโ€™re committed to using live feeders, breeding your own guppy colony at home is far safer than buying off the shelf.

    Poor Nutritional Value

    Yes, feeder fish provide different nutrients than your fish would normally get from a singular fish food. However, a feeder fish is only as nutritional as the nutrition it eats. Since feeder fish aren’t usually taken care of in a commercial setting, they provide little to no additional nutritional benefit.

    Thiaminase

    The enzyme thiaminase can also cause more trouble than what it’s worth. This is an enzyme that’s necessary for breaking down vitamin B1 in many species, including goldfish, minnows, and other invertebrates. Overindulgence of a thiaminase source, like feeder fish, can start to cause a thiamin deficiency in the predator. This can quickly lead to health problems that may not be obvious to treat and eventual death.

    How To Keep Them Healthy

    The key to a happy and healthy fish is giving happy and healthy feeder fish. This means only purchasing from fish stores that keep clean and healthy tanks, and setting up your own breeding tanks if possible.

    This setup doesn’t need to be extensive, but it should support whichever species you choose to raise. There are a few things to keep in mind when choosing a feeder:

    1. Pick a species that can be easily eaten. In terms of size, your fish should be able to swallow the other fish without any problems. Avoid species with sharp fins or body features that could potentially damage your fish’s mouth or esophagus.
    2. Pick a livebearer species. Livebearer species are practically self-sustainable and will provide food for your fish as long as you give them a space to do so. It is also recommended to keep herbivorous livebearers as they can be given plenty of nutritional value through algae flakes and pellets..
    3. Price. Of course, you will need to consider the price if planning to feed store-bought fish. Keep in mind that you don’t need to feed your fish fresh food every day of the week. In fact, it’s better to only feed them once or twice a week! Still, you will need to consider the price, frequency, availability, and quality of the feeders.

    Can you feed your fish other fish?

    Yes! Many species of tropical fish available are predatory fish that rely on consuming other fish and animals for nutrition. In their natural habitat, they would receive nutrients and enrichment from hunting, which can be replicated in the aquarium setting.

    What is the best feeder fish?

    The best feeder fish is one that has been prepared for feeding. Many pet stores have feeders available, but their tank setups usually suffer from overpopulation and poor water quality. The best feeder will come from a clean setup that receives plenty of nutritional value.

    How often should you feed live fish?

    Live fish should be given as a treat once or twice a week. Depending on the size of the fish, and the size of the feeders, your fish might only need to hunt every couple of days.

    If your feeder fish are from a reputable source, you may be able to keep uneaten food in the tank. Otherwise, they should be removed.

    Conclusion

    One of the reasons you likely got a predatory fish is to feed it! Feeding time can be exciting, and offering live foods can be a great way to introduce enrichment and additional nutrients into the aquarium. However, there are a few considerations that need to go into picking the right feeder fish, like size and quality. For the best results, raise live fish in a secondary aquarium.

    ๐ŸŸ Want to learn more? This article is part of our complete Aquarium Care Guide. your ultimate resource for water chemistry, maintenance, feeding, disease prevention, and everything you need for a healthy tank.

  • The 21 Smallest Aquarium Fish in the Trade: My Picks After 25 Years

    The 21 Smallest Aquarium Fish in the Trade: My Picks After 25 Years

    Iโ€™ve personally kept several fish from this list. chili rasboras, pea puffers, and zebra danios. and cared for virtually all of them during my years working at local fish stores. The single most important thing I tell people getting into nano fish: donโ€™t let the small size fool you into thinking a small tank will do. Every fish on this list needs to be kept in a group, and a group still needs space. I always push people toward a 10-gallon minimum, with bigger being better. Hereโ€™s my full breakdown of the 21 smallest aquarium fish in the trade.

    Key Takeaways

    • One of the smallest fish in the aquarium trade is the dwarf pygmy goby.
    • The world’s smallest fish is believed to be Paedocypris progenetica, an unnamed fish from Sumatra.
    • Small aquarium fish don’t require any additional consideration, but tank mates should have a similar temperament.
    • Popular small fish include zebra danios, chili rasboras, dwarf pea puffers, and white cloud minnows.

    The 21 Smallest Aquarium Fish In The Trade

    Some of the smallest fish in the world can be brought into the home aquarium. What they lack in size they bring in color, movement, and excitement. Check out the video from our YouTube Channel.

    It should be noted that just because these fish are small does not necessarily make them the most affordable or hardy species. Some may also be limited in availability or difficult to find.

    1. Dwarf Pygmy Goby

    • Scientific Name: Pandaka pygmaea
    • Adult Size: 0.35-.0.45 inches
    • Tank Size: 5 gallons
    • Temperament: Peaceful, bottom-dwelling

    To begin this list, we start with one of, if not, the world’s smallest fish species: the dwarf pygmy goby. Also known as the Philippine goby, these incredibly tiny fish max out at just under a half-inch long. They have mottled black, brown, and white colors with a typical elongated goby body.

    The dwarf pygmy goby originates from muddy bottoms throughout Southeast Asia. They regularly move between freshwater and brackish conditions; many hobbyists prefer keeping them in medium salinity, but they can also be kept in purely fresh conditions.

    Unfortunately, the dwarf pygmy goby is a critically endangered species and distribution is highly limited. Hobbyists are most likely to find these fish available for purchase near their natural habitats.

    2. Exclamation Point Rasbora

    <a href=Exclamation Point Rasbora” class=”wp-image-1063164″/>
    • Scientific Name: Boraras urophthalmoides
    • Adult Size: 0.50-0.65
    • Tank Size: 10 gallons
    • Temperament: Peaceful, shy

    The exclamation point rasbora is colorful and aptly named for the black-and-orange-outlined ‘!’ on the sides of its body. These fish are native to Thailand but can be found for sale throughout the aquarium industry relatively easily.

    The exclamation point rasbora needs to be kept in larger groups, with most hobbyists recommending a school of at least 10 or more. This is because these fish are very shy and skittish and will find comfort in a larger school. For the same reasons, the aquarium should be densely planted with plenty of floating plants. Tank mate compatibility is also limited.

    3. Chili Rasbora

    Chili Rasboras
    Chili Rasboras

    Use Promo Code ASDFLIPPROMO

    A great nano schooling fish. Males display brighter colors. Best in groups of 6 or more

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    • Scientific Name: Boraras brigittae
    • Adult Size: 0.75-1.0 inches
    • Tank Size: 10 gallons
    • Temperament: Peaceful

    The chili rasbora has gained popularity over the past few years as being one of the best freshwater species that only grow to an inch. These fish are firey-orange and will bring tons of color and movement to the aquarium.

    Like most other small fish, chili rasboras are shy schooling fish that excel in a large group with plenty of vegetation. If keeping no other fish, a 10 gallon aquarium can comfortably keep a school of 20 individuals.

    ๐Ÿ† My top pick from this entire list: Chili rasboras are my #1 recommendation for nano tanks. Iโ€™ve kept them personally and theyโ€™re absolutely stunning in a large group against a planted background. The color payoff in a well-planted 10-gallon is hard to beat. they look like living embers.

    The chili rasbora is a relatively hardy fish that can adapt to some changes in water parameters, but good tank husbandry is a must. With excellent care, these fish can live to be 8 years old!

    4. Fire Ember Tetra

    • Scientific Name: Hyphessobrycon amandae
    • Adult Size: 0.75-1.0 inches
    • Tank Size: 10 gallons
    • Temperament: Peaceful

    Similar in appearance to the chili rasbora, the fire ember is bright orange. However, fire embers are hardier, less skittish, and much more affordable than chili rasboras.

    Fire ember tetras originate from the Amazon River in South America. They prefer a heavily planted aquarium and a school of at least 6 or more. These small fish have been captive-bred and can be kept in a wide range of aquarium conditions.

    5. Least Killifish

    • Scientific Name: Heterandria formosa
    • Adult Size: 0.75-1.50 inches
    • Tank Size: 10 gallons
    • Temperament: Peaceful

    Though they’re named killifish, least killifish are not true killifish and are a type of minnow instead. This means that they are small, hardy fish that can complete a natural biotope setup or densely planted aquarium. They are also one of the few aquarium species available that is native to the southeast United States.

    Least killifish are one of the smallest species of minnow available, making them a perfect addition to the nano aquarium. These are not schooling fish, but they greatly enjoy the company of others.

    6. Pygmy Sunfish

    • Scientific Name: Elassoma spp.
    • Adult Size: 1.0-1.5 inches
    • Tank Size: 10 gallons
    • Temperament: Shy, live-feeders

    Pygmy sunfish are sure to make a big splash in the aquarium hobby in the near future. These electric black and blue fish almost resemble a small species of cichlid, without the aggression. Instead, these fish are native to the southeast United States and display paired mating behaviors.

    Pygmy sunfish are currently difficult to find for sale, though demand is growing. There is one major challenge that comes with keeping these fish though, and this is that they require a live food diet. They are ambush predators and need to hunt for prey that wiggles and moves.

    The best home for a pygmy sunfish will have a live food system up and running.

    7. Pygmy Corydoras

    Pygmy Cory
    Pygmy Cory

    A smaller variety of Cory Catfish. Grows to less than 1.5 inches in length. A peaceful bottom dwelling fish

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    • Scientific Name: Corydoras pygmaeus
    • Adult Size: 0.75-1.5 inches
    • Tank Size: 10 gallons
    • Temperament: Peaceful, bottom-dwellers

    Though some of the other tiny fish on this list might be hard to find at your local fish store, the pygmy corydoras is luckily easy to find.

    These small bottom-dwellers are native to Brazil and appreciate a soft substrate with plenty of live plants. They have natural brown and white colors and are easy to tell apart as females are almost double the size of males! They are very difficult to breed in the home aquarium but have been done so successfully at a commercial scale.

    Pygmy corydoras are one of the few species on this list that can be safely housed with larger tropical fish. As long as they are kept in schools of at least 6 or more and are given plenty of coverage, they will do well in a traditional community tank setup.

    8. Dwarf Pea Puffer

    Freshwater Pea Puffers
    Freshwater Pea Puffers

    At only an inch in length, this is the smallest pufferfish you can purchase in the aquarium hobby

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    • Scientific Name: Carinotetraodon travancoricus
    • Adult Size: 1 inch
    • Tank Size: 10 gallons
    • Temperament: Semi-aggressive

    Maybe not the smallest fish on this list, the dwarf pea puffer is certainly the most adorable. These plump little fish are one of the only true freshwater species of puffer; most other species prefer brackish waters. Instead, these fish do best in a heavily planted freshwater aquarium.

    ๐Ÿก From my experience: Pea puffers have enormous personalities for such a tiny fish. Iโ€™ve kept them and always enjoyed them, but they can be nippy with tank mates. They do best in a species-only setup or with very carefully chosen companions. Rewarding fish, just go in with the right expectations.

    The dwarf pea puffer might be small, but they can be aggressive. The problem is that males and females look the same to us, but males can tell each other apart. Male pea puffers can be territorial towards other males in the tank, especially during breeding periods. Because of this, it might take some time to work out a compatible male-to-female ratio.

    9. Clown Killifish

    Clown Killifish
    Clown Killifish

    A colorful nano killifish. Best in low flow tanks

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    • Scientific Name: Epiplatys annulatus
    • Adult Size: 1.0-1.5 inches
    • Tank Size: 5 gallons
    • Temperament: Peaceful, predatory

    Also known as the banded panchax, the clown killifish is a very interesting fish to keep. These might not be the smallest fish on the list, but they’re one of the smallest and most effective predators. The clown killifish stays just below the surface of the water, waiting for insects and other small organisms to land. When ready, they use their upturned mouths to quickly catch their prey!

    In the aquarium setting, this can be replicated by offering small insects, such as fruit flies and mosquito larvae. While predators, clown killifish can be kept alongside a variety of community tank species, like tetras and corydoras. However, they are rather solitary and enjoy the company of one or two others.

    10. Spotted Blue Eye Rainbowfish

    • Scientific Name: Pseudomugil gertrudae
    • Adult Size: 1 inch
    • Tank Size: 10 gallons
    • Temperament: Peaceful, shy

    Possibly the most beautiful fish on this list, the spotted blue eye rainbowfish is a shimmering bluish-yellow with elongated speckled fins. Because of their appearance, these are also some of the most expensive fish listed.

    The spotted blue eye rainbowfish only grows to be about an inch at mature size. They originate from shallow, slow-moving waterways throughout Southeast Asia as well as Australia. Spotted blue eye rainbows can withstand low pH levels, making them a good candidate for blackwater or biotope setups.

    These fish do best in groups of at least 6 or more and as one of the only species in the aquarium. They are often kept with peaceful bottom-dwellers, including snails and shrimp.

    11. Green Neon Tetra

    <a href=Green Neon Tetra School” class=”wp-image-1067276″/>
    • Scientific Name: Paracheirodon simulans
    • Adult Size: 0.75-1.0 inches
    • Tank Size: 10 gallons
    • Temperament: Peaceful

    The green neon tetra isn’t seen in the aquarium as often as the more recognizable neon tetra, but these tiny fish do well in a school in most tank setups. A few considerations are needed to keep them, though.

    While tetras are seen as some of the hardiest fish in the aquarium hobby, green neon tetras are a little more sensitive to imperfect water conditions. These fish originate from exclusively blackwater conditions in South America. This means that blackwater conditions with soft, acidic water parameters need to be matched in the home aquarium. They also need heavy plant coverage, preferably with leaf litter that sustains a natural population of small foods.

    12. Kubotai Rasbora

    • Scientific Name: Microdevario kubotai
    • Adult Size: 0.50-1.0 inches
    • Tank Size: 10 gallons
    • Temperament: Peaceful

    One of the less common species of rasbora, the Kubotai rasbora is hard to miss! These fish are naturally neon green from Southeast Asia.

    For their size, these rasboras originate from moderately-flowering waterways. This, in addition to plant life, makes the water highly oxygenated, which should be recreated in the aquarium setting with plants and air bubblers. Surface water may also be agitated as long as it’s not overpowering the rasboras.

    Otherwise, Kubotai rasboras are relatively straightforward to keep as long as water parameters are maintained. They are a schooling fish that need to be kept in a group of at least 6 or more. Tank mate pairing may be difficult as other inhabitants must also be a similar size and be able to withstand a moderate water flow.

    13. White Cloud Minnow

    White Cloud Minnow in Planted Tank
    • Scientific Name: Tanichthys albonubes
    • Adult Size: 1.5 inches
    • Tank Size: 10 gallons
    • Temperament: Peaceful, active

    While many of the smallest aquarium fish are fun and cute to look at, many are shy and reclusive. If you’re looking for something small and active, the white cloud minnow might fit your next coldwater aquarium setup!

    The white cloud minnow is a bold fish with a silver body, bright white horizontal stripe, and unmistakable red fins. They originate from China but have been found in other regions of Southeast Asia. Unfortunately, they are nearly considered extinct in their natural habitat.

    Luckily, these are some of the easiest fish to keep in the aquarium hobby and are highly prolific! They will naturally mate when kept in a school of 6 or more. White cloud minnows are a coldwater species, which means that tank mate pairing can be tricky. They also require some water flow and are relatively active in the top and middle portions of the aquarium.

    14. Glowlight Tetra

    <a href=Glowlight Tetra” class=”wp-image-1084544″/>
    • Scientific Name: Hemigrammus erythrozonus
    • Adult Size: 1.5-2.0 inches
    • Tank Size: 10 gallons
    • Temperament: Peaceful

    You might think that glowlight tetras are artificially dyed, but these bright orange fish are all natural! These tetras are a little bigger than the other species on this list, but they’re a perfect addition to a more active community tank.

    Glowlight tetras originate from South America and do best in a heavily planted aquarium with a dark substrate that lets their natural colors show. These fish are a loose schooling species and need to be kept in groups of at least 6 or more. If they’re swimmingly together in a tight school, then they might be overwhelmed by the other tank mates in the aquarium and a larger school may be necessary.

    15. Dwarf Emerald Rasbora

    Dwarf Emerald Rasbora
    Dwarf Emerald Rasbora

    A colorful Rasbora fish that needs large numbers for its personality to really show. Needs at least a group of 10.

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    • Scientific Name: Danio erythromicron
    • Adult Size: 1.0-1.5 inches
    • Tank Size: 10 gallons
    • Temperament: Peaceful

    The dwarf emerald rasbora is not a common species to see at your local fish store, but these fish complement the colors and behaviors of celestial pearl danios and other small tetras. They may also be advertised as a thick band purple zebra danio.

    Dwarf emerald rasboras have a very limited range in Inle Lake, Myanmar. They are shoaling fish and the male-to-female ratio needs to be balanced. Males are slightly smaller but more colorful than their female counterparts. Because they’re so small, these fish do best in groups of at least 10 or more.

    Another concern surrounding the dwarf emerald rasbora is during feeding time. Though these fish are confident in numbers, they can be outcompeted during feeding times by other more active species. They also have small mouths, which means that they might have difficulty eating some foods.

    16. Borneo Sucker Loach

    • Scientific Name: Gastromyzon punctulatus
    • Adult Size: 1.5-2.0 inches
    • Tank Size: 20 gallons
    • Temperament: Active, social

    Another species not commonly found for sale in the hobby is the Borneo sucker loach, also known as the spotted borneo sucker. These fish are named after the country they originate from and the small yellow spots that cover their dark body.

    The Borneo sucker loach is a relatively challenging fish to keep. These loaches need high water flow, and social groups of at least 4 or more. They should have a healthy supply of natural algae available, but will also need high-quality algae wafers and flakes.

    Other tank mates should be able to tolerate a more active and outgoing species. Though these loaches aren’t aggressive, other small and timid fish might be overwhelmed.

    17. Zebra Danio

    Zebra-Danio
    • Scientific Name: Danio rerio
    • Adult Size: 1.0-2.0 inches
    • Tank Size: 10 gallons
    • Temperament: Active

    The zebra danio is a staple fish in the aquarium hobby. While they’re not the world’s smallest fish, they’re one of the most recognizable.

    The zebra danio originates from parts of Southeast Asia and especially prefers cold water temperatures. However, they have been successfully bred and adapted to the aquarium hobby for years and can now be kept in nearly every temperature range.

    These fish are extremely hardy and can be paired with most fish that fit inside their preferred temperature zone. Zebra danios prefer the upper portions of the water column, where they’ll zoom back and forth across the tank in their school. Smaller, less active tank mates should be avoided.

    ๐ŸŸ From my experience: Zebra danios were one of the first fish I kept and they remain one of the best starter fish in the hobby. Theyโ€™re incredibly hardy, active schoolers, and nearly bulletproof. a great choice if youโ€™re new to nano tanks and want something forgiving.

    19. Gardneri Panchax Killifish

    • Scientific Name: Fundulopanchax gardneri
    • Adult Size: 2.0-2.5 inches
    • Tank Size: 20 gallons
    • Temperament: Peaceful

    One of the most colorful fish on this list, the Gardneri Panchax killifish grows well over one inch but can fill a small aquarium all on their own. Males are brighter in color, but both males and females feature bright green, orange, red, and blue coloration. These fish originate from unique marsh habitats that experience seasonal droughts throughout areas of Africa, like Nigeria and Cameroon.

    Because of their changing environment, these killifish are very hardy and do well in most aquarium setups. A tight aquarium hood is necessary.

    20. Scarlet Badis

    Scarlet Badis
    Scarlet Badis

    A great colorful nano fish. They are known for being semi-aggressive. Best if keep solo or in pairs

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    • Scientific Name: Dario dario
    • Adult Size: 1 inch
    • Tank Size: 10 gallons
    • Temperament: Generally peaceful

    The scarlet badis is a perfect freshwater nano fish for hobbyists who prefer cichlid behavior. Badis are like mini-cichlids, just without the aggression!

    The scarlet badis is a colorful red and blue fish that originates from India and Bhutan. When ready, males and females form mating pairs. Males can become aggressive towards each other during these times, so it’s recommended to only keep one male and female per tank.

    Otherwise, scarlet badis are timid fish that will shy away from more active and overbearing species. They need plenty of plants and hiding spots to spawn and to feel safe. These fish also need a high-quality diet mixed with flake food and live food, but should not be overfed as they’re prone to obesity.

    21. Emerald Eye Rasbora

    • Scientific Name: Rasbora dorsiocellata
    • Adult Size: 1.0 inch
    • Tank Size: 10 gallons
    • Temperament: Peaceful

    Another less commonly known rasbora, the emerald eye rasbora is simple in color with a greenish-grey body and highlighted dorsal fin. These fish originate mainly from Thailand but can be found throughout flowing streams across Southeast Asia.

    Emerald eye rasboras have peaceful schooling behaviors. They do well as a background fish in a school of 6 or more but may be timid around more active species.

    Other Species

    There are two species listed below that are not available for aquariums and the others are often mentioned, but we ran out of space. Let me know in the comments if we missed any fish and I’ll add them to the list.

    • Midget dwarf goby
    • Corfu dwarf goby
    • Celestial pearl danio (AKA Galaxy Rasboras)
    • Mosquito rasboras
    • Bettas (AKA Siamese Fighting Fish) – They can live in small tanks but aren’t small themselves)
    • Harlequin Rasbora – popular, but too big to be considered for this list

    Conclusion

    Wanting to keep the smallest fish in the world in the smallest aquarium possible? Many species of fish stay under an inch long, and even more stay under 2 inches long. Most species of small fish don’t require any special considerations in terms of aquarium requirements, but some may be more easily intimidated by larger and more active species than others.

    It’s also important to keep in mind that many small fish are jumpers, so a tight aquarium lid is necessary!

    ๐Ÿ“˜ Want to learn more? This article is part of our complete Freshwater Fish Guide. your ultimate resource for freshwater species, care tips, tank setup, and more.

  • Algae Eaters for Betta Tanks: My 7 Picks After Years of Betta Keeping

    Algae Eaters for Betta Tanks: My 7 Picks After Years of Betta Keeping

    Iโ€™ve kept bettas for years, and algae is something almost every betta keeper deals with eventually. My personal go-to has always been nerite snails. theyโ€™re peaceful, do an excellent job on algae, and wonโ€™t provoke even the most territorial betta. If the tank is big enough, Iโ€™d pair them with an Otocinclus catfish or two for extra coverage. The one thing most people overlook: once you start adding algae eaters, youโ€™re moving into community tank territory. and tank size becomes more important than most people realize.

    Key Takeaways

    • The best algae eaters for Bettas are mystery snails and Otocinclus catfish
    • Some fish are poor choices due to the betta’s aggressive nature or preference for warmer waters
    • Make sure to supplement food with your algae eaters as it’s likely for them to starve without it
    • Consider live plants if you want a more natural way to combat algae by having them outcompete outbreaks

    What Is Algae?

    Algae are plant like organisms that grow their food through photosynthesis. There are many types of algae and some of them are much easier to control than others!

    Algae-In-Tank

    Algae blooms are normal in new tanks that are still going through their first cycle. However, you can expect to see some algae in mature aquariums too.

    There are many ways to control algae growth, ranging from manual scrubbing to growing live plants, but adding a few algae eaters is probably the most interesting method!

    Increasing maintenance, limiting waste products, fish food, and reducing aquarium light duration are also effective techniques that can help you beat algae.

    There’s a lot more to learn about aquarium algae! check out my guide to 10 types of aquarium algae (and how to get rid of them!) for more detailed information.

    What You Need to Know About Temperment

    Betta fish are known for their aggressive nature, but they don’t always deserve this reputation. Many aquarists keep their bettas with a variety of other fish without any problems, although there are always risks involved.

    Veil-Tail-Betta

    You see, betta fish were originally bred for fighting, so it’s no surprise that many individuals still have a mean streak. Some bettas are just more aggressive than others, and it has a lot to do with their own individual personality.

    Tank size matters too, and upgrading to a larger aquarium can help to curb aggressive betta fish behavior. However, you should always have a backup plan in case your betta doesn’t get along with its new algae-busting friends.

    โš ๏ธ The biggest mistake I see: People try to add algae eaters to a 5 or 10-gallon betta tank without realizing theyโ€™re now running a community setup. The moment you add another inhabitant, tank size, filtration, and territorial behavior all become critical factors. My recommendation: if you want algae eaters with your betta, aim for at least a 20-gallon tank.

    Go ahead and check out my guide to the 15 best betta tankmates to learn much more!

    Algae Eater For Betta Tank – 7 Top Picks

    There are many amazing algae eaters in the aquarium hobby, but these seven species are my top picks for your betta fish aquarium! Check out the video from our YouTube Channel and the additional details below from our blog post!

    1. Octocinclus Catfish

    Otocinclus Catfish
    Otocinclus Catfish

    A small algae-eating fish. Also great with freshwater shrimp.

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    • Scientific name: Otocinclus sp.
    • Difficulty: Moderate
    • Adult size: 1.75 inches
    • Minimum tank size: 10 gallons
    • Temperature: 70 – 77 ยฐF
    • Algae types: Soft green algae and diatoms

    Otocinclus catfish are about the smallest algae-eating fish in the hobby. These nano fish are also known as dwarf suckers for their habit of sucking onto aquarium glass, plants, and hardscape features.

    Otos are extremely peaceful and make excellent algae eaters for betta tanks, although they are not the ideal choice for beginners or aquarists with small tanks. They can be kept in tanks as small as 10 gallons, although 15 gallons or larger would be better.

    If your otocinclus catfish do their job a little too well and eat all the algae in their tank, you’ll need to supplement their diet with algae wafers and some soft greens like zucchini. They are social fish, so pick up a school of five or more.

    2. Nerite Snail

    Best Algae Snail
    Horned Nerite Snail
    Horned Nerite Snail

    Horned Nerite Snails are excellent algae eaters for planted tanks.

    Click For Best Price Buy On Amazon
    • Scientific name: Neritina spp., Vittina spp., Clithon spp.
    • Difficulty: Easy
    • Adult size: 0.75 – 1 inch
    • Minimum tank size: 5 gallons
    • Temperature: 70 – 80 ยฐF
    • Algae types: Soft green algae, diatoms, green spot algae

    Nerite snails are the smallest algae eaters and the number one choice for small betta aquariums in the 5-gallon range. These hard-working mollusks are some of the best-looking inverts in the hobby, and they do a terrific job of cleaning algae in an aquarium.

    Nerites breed in brackish water, so there’s no chance of finding any baby snails in your tank. However, they will lay a few eggs here and there. Most betta fish will get along great with nerite snails, but some aggressive fish will nip at nerites.

    ๐Ÿ† My personal pick: Nerites are the algae eater I reach for first in betta tanks. Iโ€™ve used them in my own setups for years. They work even in 5-gallon tanks, they wonโ€™t breed in freshwater, and most bettas leave them completely alone. If your tank is 20 gallons or larger, Iโ€™d add a couple of Otocinclus alongside them for even better algae control.

    3. Mystery Snail

    Mystery-Snail
    • Scientific name: Pomacea bridgesii
    • Difficulty: Easy
    • Adult size: 2 inches
    • Minimum tank size: 5 gallons
    • Temperature: 70 – 80 ยฐF
    • Algae types: Various

    Mystery snails are large aquarium invertebrates that grow to about the size of a golf ball. They come in a variety of cool colors, making them an interesting display animal for your betta tank.

    These snails will eat algae and uneaten food in the tank, so they’re great for keeping your tank clean. However, they are not as good at algae control as their smaller cousin the nerite. If you keep just one, you won’t have to worry about any unsightly eggs, although they can reproduce if you keep two or more.

    Other snail species, like rabbit snails and ramshorn snails, are helpful for algae control, although you might want to avoid species like ramshorns and Malaysian trumpet snails if you don’t like the idea of breeding snails in your tank.

    4. Bristlenose Pleco

    Bristlenose Pleco
    Bristlenose Pleco

    The Bristlenose Pleco is a smaller Pleco that does a great job of eating algae. Peaceful and gets along with most fish

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    • Scientific name: Ancistrus spp.
    • Difficulty: Easy
    • Adult size: 5 inches
    • Minimum tank size: 20 gallons
    • Temperature: 74 – 80 ยฐF
    • Algae types: Hair algae, cyanobacteria

    Bristlenose plecos are excellent algae eaters for larger betta tanks of at least 20 gallons. They love to eat algae and graze on wood, so make sure there’s plenty of driftwood in the tank.

    Full-grown bristlenose plecos may look kind of scary with their interesting bushy beards, but these fish are very peaceful with other species and they won’t bother your betta fish. On the downside, plecos tend to produce a lot of waste due to their vegetarian diet, so they need decent filtration and regular tank maintenance.

    5. Molly Fish

    Black-Molly
    • Scientific name: Poecilia sphenops
    • Difficulty: Easy
    • Adult size: 3-6 inches
    • Minimum tank size: 20 gallons
    • Temperature: 75 – 80 ยฐF
    • Algae types: Hair algae

    Mollies are live-bearing fish that are surprisingly good at controlling algae! These hardy fish are peaceful but robust enough to hold their own against a grumpy betta.

    However, mollies are one of the larger livebearers, so you’ll need an aquarium of at least 20 gallons to combine these two species. Mollies also need fairly hard, high-pH water, so they will not make good betta tank mates in soft, acidic conditions.

    Mollies are very easy to breed, so you can expect loads of baby fish if you keep males and females together. Choose a couple of males only if you have limited space in your tank.

    6. Hillstream Loach

    Hillstream Loach
    • Scientific name: Sewellia lineolata
    • Difficulty: Moderate
    • Adult size: 2.5 inches
    • Minimum tank size: 20 gallons
    • Temperature: 64 – 80 ยฐF
    • Algae types: Soft green algae and diatoms

    The hillstream loach is one of the most unusual freshwater fish in the aquarium hobby. These little guys look almost like tiny freshwater stingrays, and they love eating algae!

    The hillstream loach is not the ideal tank mate for a betta fish, but you can make it work if you create an environment that favors both of these small fish.

    These voracious algae eaters prefer well-oxygenated, cool water with a rocky bottom, but they can be housed with a betta if your water temperature is kept in the mid-70s Fahrenheit. Adding an airstone for increased oxygenation and water movement will make them feel right at home without creating too much current in the water.

    7. Clown Pleco

    Clown-Pleco
    • Scientific name: Panaqolus maccus
    • Difficulty: Easy
    • Adult size: 3 – 5 inches
    • Minimum tank size: 20 gallons
    • Temperature: 73 – 82 ยฐF
    • Algae types: Biofilm on driftwood

    Clown plecos are not as effective as bristlenose plecos or otocinclus catfish, but their small size and peaceful nature make them great algae eaters for betta aquariums in the 20-gallon range.

    These fish are helpful algae eaters that can effectively clean up a small aquarium, although they spend most of their time feeding on driftwood.

    Others You Think Might Work, But Don’t!

    The recommended species mentioned above are not the only aquarium fish and invertebrates that feed on algae, so you might be wondering why some of the other algae eaters didn’t make the list. Read on to learn why these seven species don’t make good betta fish tank mates.

    1. Guppies and Endlers Livebearers

    Green Guppy

    Keeping guppies with your betta fish can be pretty risky, especially if you have colorful male guppies with big flowing fins. Their similar appearance may trigger some aggressive responses from your betta, but guppies are also known to nip betta fins.

    Guppies will feed on algae, although they don’t eat quite enough to keep a tank clean.

    2. Platies

    Red-Wagtail-Platy

    Platies are beautiful freshwater fish that can actually make good tank mates for your betta fish. Like guppies, these colorful livebearers are known to nip betta fins from time to time, but the main reason to avoid these active fish is their diet.

    Platies can be good algae eaters, but they just aren’t as effective as something like an otocinclus catfish or a nerite snail.

    3. Most Plecos

    Common-Pleco

    Plecostomus catfish are efficient algae eaters, although their size often turns into a problem. Most plecostomus catfish are simply too large to keep in a betta aquarium. Species like the common pleco can reach two feet in length, so adults require an aquarium that holds hundreds of gallons!

    Stick to the bristlenose and clown plecos unless you keep your betta fish in a very large community tank.

    4. Amano Shrimp

    Amano Shrimp Male
    Male Shrimp

    Amano shrimp are one of the best algae eaters for planted freshwater aquariums but they are not the best tank mates for a betta fish.

    Unfortunately, betta fish tend to nip at these gentle crustaceans and they may even eat smaller specimens. Some betta fish will get along great with amano shrimp, but it’s just not worth the risk.

    5. Cherry Shrimp

    Cherry Shrimp

    Adding cherry shrimp to your betta fish tank is probably not going to end well. Betta fish will eat these miniature invertebrates if they can catch them, so it’s really just a matter of time before these colorful shrimp disappear into your betta’s belly.

    Unfortunately, the same goes for other shrimp species like ghost shrimp and young bamboo shrimp. If you would like to attempt keeping shrimp with your betta fish, my recommendation would be to start with a few ghost shrimp or feeder shrimp and see how your fish responds.

    6. Siamese Algae Eater

    Siamese-Algae-Eater

    Siamese algae eaters (SAEs) are avid algae eaters, but you should think twice before adding these active Asian fish to your betta tank.

    Siamese algae eaters grow to 6 inches and they should always be kept in schools, so they need a much bigger aquarium than your average betta fish tank. Siamese Algae eaters also tend to stop eating algae as they mature, and they can get a little aggressive around feeding times.

    7. Chinese Algae Eaters

    Chinese Algae Eater Fish

    The Chinese algae eater is not a smart choice for your betta tank because these freshwater fish can grow to over 10 inches in length and need a tank of at least 55 gallons for long-term care.

    Even if you do keep your betta in such a spacious aquarium, there are more efficient and peaceful options for algae control.

    Cleaner Fish

    Some cleaner fish make great additions to a betta tank, although these helpful bottom feeders are not going to help with your algae problem. Many beginner aquarists assume that bottom feeders eat algae or that they do not need to be fed, but that’s not exactly true.

    Cleaner fish will happily snack on any uneaten betta food that sinks to the bottom, although you’ll still need to feed them a healthy diet. The following cleaner fish can make great tank mates for your betta fish, just don’t expect them to do much about the algae.

    1. Corydoras Catfish

    Panda Cory
    • Scientific name: Corydoras spp.
    • Difficulty: Easy
    • Adult size: 1 – 3 inches (depending on species)
    • Minimum tank size: 30 gallons for most species
    • Temperature: 72 – 78 ยฐF
    • Diet: Omnivorous. Provide a sinking food such as a bottom-feeder tablet

    Corydoras catfish, also known as cories, are gentle bottom dwellers that make great tankmates for betta fish. These schooling fish love to hang out at the bottom of the tank and search through the substrate for tasty morsels.

    Cory catfish are social creatures, so it’s important to buy a school of 5 or more of the same species. Smaller cories are a better fit for most betta aquariums, but keep in mind that the smallest species (dwarf and pygmy cories) tend to hang out in the water column or on plant surfaces more than the bottom of the tank.

    2. Kuhli Loach

    Kuhli Loach
    Kuhli Loach

    Kuhli Loaches are hardy bottom-dwelling fish. Nocturnal in nature. Gets along with many fish and tolerate of coldwater environments

    Click For Best Price
    • Scientific name: Pangio kuhlii
    • Difficulty: Easy
    • Adult size: 3 – 4 inches
    • Minimum tank size: 20 gallons
    • Temperature: 73 – 86 ยฐF
    • Diet: Omnivorous. Provide a sinking food such as a bottom-feeder tablet

    Kuhli loaches are small, eel-like bottom dwellers that will search the substrate of your betta tank for uneaten food. These peaceful fish are mostly nocturnal, so you might not see them too much during the day.

    Kuhli loaches are social fish, so you’ll need a small group of four or more. They will burrow into the sand or gravel of your tank, but be sure to add some hiding places like driftwood and rocks to help them feel secure during the day.

    3. Whiptail catfish

    • Scientific name: Farlowella spp.
    • Difficulty: Moderate
    • Adult size: 4 – 6 inches
    • Minimum tank size: 20 gallons
    • Temperature: 72 – 79 ยฐF
    • Diet: Sinking foods and algae

    The whiptail catfish is one of the strangest freshwater fish species, but also one of the most peaceful. These camouflaged fish look just like a twig, which helps them stay hidden from predators in the wild.

    Whiptail catfish are actually good algae eaters in their own right, although you’ll need to supplement their diet with sinking foods like tablets and wafers.

    Other Techniques for Controlling Growth

    Algae eaters can be extremely helpful for cleaning up your betta aquarium, although they are not the only option. Serious algae growth is usually a symptom of an imbalance of light and nutrients and there are a few steps you can take to control this pesky stuff if you have an aggressive betta that doesn’t want to share their tank.

    Try these four techniques for controlling algae growth:

    1. Cut the lights

    Algae tend to thrive in high-light situations, especially if there are plenty of nutrients in the water. Make sure your betta tank is not exposed to any direct sunlight.

    Powerful aquarium lights will also benefit algae, so use a timer to maintain a regular lighting schedule of about 6 hours or so each day.

    2. Grow Live Plants

    Staurogyne Repens Plant

    Live plants look great and create and healthy home for your betta fish. However, their true benefit lies in their algae-fighting abilities!

    Healthy live plants effectively compete with algae and help to soak up excess nutrients in the water, so growing a few fast-growing stem plants can really help with persistent algae problems. However, dead plant matter actually decreases water quality, so take good care of your plants and fertilize them regularly.

    3. More Maintenance

    Poor water quality with high nitrate levels is a common cause of algae blooms. Test your tank water and perform regular water changes to keep your nitrate levels down to 20 parts per million or less.

    You can also clean and remove algae manually during your maintenance routine. Grab your algae scraper and clean the glass before sucking water out of the tank with your gravel vacuum. A toothbrush works great for cleaning ornaments, rocks, and driftwood.

    4. Reduce Feeding

    Excess nutrients from over-feeding fish is one of the leading causes of poor water quality and excessive algae growth. Feed your betta fish once or twice a day and watch to see that your pet is finishing all the food. Uneaten pellets or granules that sink to the bottom will go to waste and increase nitrate and phosphate levels.

    Can you have an algae eater with a betta?

    There are many good algae eaters in the hobby that can live with betta fish, although it’s important to select a species that will be happy in your aquarium. Most algae-eating fish need a tank of at least 20 gallons, so snails may be the best choice if you have a small tank.

    How do I get rid of algae in my betta tank?

    Algae eaters are a great way to manage excess algae, although you can also remove algae manually when cleaning your tank.

    Film algae can be removed from the tank glass with an algae scraper, while soft algae on the substrate can be sucked out with your gravel vacuum. Remove tougher algae on your hardscape with a small brush.

    What is the best bottom feeder for a betta fish tank?

    Corydoras catfish and kuhli loaches are some of my favorite bottom dwellers for large betta fish tanks. Malaysian trumpet snails are a good option for small tanks, although many aquarists prefer to avoid these inverts as they tend to multiply fast in nutrient-rich environments.

    Can you put a betta with a plecostomus?

    Plecos are good algae-eating fish for larger betta aquariums, although it’s important to choose the right species. Smaller species like the bristlenose and clown plecos are ideal for tanks of 30 gallons or more. Avoid larger varieties like the common pleco and sailfin pleco unless you have a very large fish tank.

    How do I control algae in my betta tank?

    Excess light and nutrients are common causes of algae, so make sure you aren’t feeding your fish too much, and avoid positioning your tank in direct sunlight or leaving your tank lights on all day. Good filtration, frequent maintenance, and regular water changes are also vital for keeping a clean tank.

    Final Thoughts

    Algae eaters and bottom dwelling fish are fascinating creatures that can help to keep your betta aquarium looking cleaner for longer. However, you should take your time before choosing your betta clean-up crew and make sure each species will live happily in your tank size and water parameters.

    Have you kept algae eaters in your betta fish aquarium? Share your favorite species in the comments below!

    ๐Ÿ“˜ Want to learn more? This article is part of our complete Betta Fish Guide. your ultimate resource for betta care, types, tank setup, feeding, tank mates, and more.

    ๐ŸŒฟ Want to learn more? This article is part of our complete Planted Tank & Aquascaping Guide. your ultimate resource for aquarium plants, aquascaping styles, substrates, and more.

    References

  • Here Are The Top 12 Smallest Goldfish (With Pictures!)

    Here Are The Top 12 Smallest Goldfish (With Pictures!)

    Not all goldfish get huge. that’s one of the biggest misconceptions in the hobby. After keeping multiple goldfish varieties over the years, I can tell you there are breeds that stay compact enough for a 20-30 gallon tank without compromising their health. These are the 12 smallest varieties worth considering.

    If youโ€™re in search of the smallest goldfish for your compact tank, youโ€™ve come to the right place. This article lists the top breeds that donโ€™t just fit in. they thrive in smaller aquatic environments. Get ready to explore options that celebrate size in small packages, tailored for limited spaces.

    Key Takeaways

    • The smallest goldfish varieties, like Pompon or Bubble Eye goldfish, are ideal for medium sized tanks, offering a diverse range of colors, shapes, and need specific care for their vibrant looks and delicate health
    • Even though considered small for their species, all goldfish require ample space (at least 20 gallons per fish), high water quality, a stable temperature, and it have peaceful, slow-moving tank mates.
    • Goldfish care involves more than just feeding; they require regular water changes, a good filtration system, and a tank free from sharp objects that can harm their unique features.

    Top 12 Smallest Goldfish Breeds

    While most types of goldfish are admittedly large and more suited for larger aquariums, these fish listed on this list are some of the smallest breeds you can find.

    Note that there is not a smaller breed listed for slim-bodied goldfish. Slim-bodied goldfish do get longer than the fancy varieties and have larger tank requirements. Stick to fancy breeds if you have a smaller tank or plan to keep your fish in an aquariums versus a pond. Slim-bodied goldfish make excellent choices for ponds either on their own or with Koi fish.

    1. Pom Pom

    • Goldfish Type: Fancy
    • Adult Size: 4. 6 inches
    • Color Pattern: Various
    • Unique Traits: Ball-shaped nasal growth

    The Pompom Goldfish is certainly a peculiar sight with their adorable ball-like growths on top of their nose. Given their delicate nasal septas, you should make sure that they are kept away from any kind of danger and sharp objects that may harm them.

    These friendly creatures prefer to be around companions so itโ€™s best if multiple goldfish live together as swimming in groups encourages their activity levels.

    2. Bubble Eye

    • Goldfish Type: Fancy
    • Adult Size: 3. 5 inches
    • Color Pattern: Various
    • Unique Traits: Huge bubble eyes

    Introducing the Bubble Eye Goldfish, a captivating breed that stands out for its peculiar physical characteristics. This type of goldfish can be up to five inches long and their hues range from solid red to fascinating two-tone combinations – giving your aquarium an eye-catching splash of color! They also have bubble sacs located below their eyes adding more uniqueness.

    It is important to note that Bubble Eyes need extra care in order for them to stay healthy since they are quite fragile creatures. Make sure you provide everything these fish require so as not neglecting any vital aspect in terms of nourishment and water quality if you want them swimming around with vigor all year round!

    3. Pearlscale

    Pearscale-Goldfish
    • Goldfish Type: Fancy
    • Adult Size: Up to 8 inches
    • Color Pattern: Various
    • Unique Traits: Golfball-shaped body, with prominent domed scales

    Pearlscale Goldfish is a fantastic pick for aspiring goldfish hobbyists. These gentle fish are known for their signature pearl-like scale patterns and can grow up to can average of 4 – 5 inches in size. As one of the delicate fancy varieties, these beautiful creatures require special care when it comes to water conditions inside an aquarium if you want them to thrive.

    Their scales create a golfball like texture. The breed can also include single or double tails.

    4. Celestial Eye

    • Goldfish Type: Fancy
    • Adult Size: 5. 6 inches
    • Color Pattern: Orange, white, or orange and white
    • Unique Traits: Upward-facing eyes and no dorsal fin

    The Celestial Eye Goldfish is quite the handful when it comes to upkeep, their eyes point upwards and require dim illumination for protection from damage. Their environment should have excellent water quality at all times, as they are a delicate species and donโ€™t fare well in unstable atmospheres.

    Having peaceful tank mates will ensure that your pet has minimal stress. Not only do these fish offer an intriguing look, but can really set off any aquarium design you may create with them around! They are best housed in environments with lots of open space and smooth decor, like silk artificial plants, as their eyes are easily injured.

    5. Veiltail

    Veiltail-Goldfish
    • Goldfish Type: Fancy
    • Adult Size: 8. 12 inches
    • Color Pattern: Various
    • Unique Traits: Extra-long tail with square edge and sail-like dorsal fin

    Beauty and elegance are embodied in a Veiltail Goldfish, renowned for its flowing fins. There are an American created breed, first introduced to the aquarium trade in the 1890s.

    This would be considered one of the hardier varieties of fancies you can purchase. It’s also one of the originals given how long it has been breed. It is the largest goldfish on this list, but has been know to live in smaller environments and live a very long time.

    6. Butterfly

    • Goldfish Type: Fancy
    • Adult Size: 5. 8 inches
    • Color Pattern: Various
    • Unique Traits: Butterfly-shaped double tail and telescope eyes

    Desired by goldfish aficionados, butterfly tail goldfish are a small type of fish that can bring natural beauty into your home if they receive the correct care.

    With their spectacular tails resembling those of butterflies, these little creatures come in a variety of patterns, including calico. They come with a high dorsal fin and will also have telescope eyes. It’s one of the more unique looking breeds out there.

    7. Eggfish

    • Goldfish Type: Fancy
    • Adult Size: 6. 8 inches
    • Color Pattern: Various
    • Unique Traits: Egg-shaped body

    A special breed of fancy goldfish, the Eggfish Goldfish has an oblong shape with no dorsal fin and is considered a luxury item. These peaceful fish should be kept in tanks alongside slower-moving tankmates. Despite their costliness, these beautiful creatures are sure to bring delight to any aquarium they grace!

    8. Ranchu

    Ranchu-Goldfish
    • Goldfish Type: Fancy
    • Adult Size: 6. 8 inches
    • Color Pattern: Various
    • Unique Traits: Lack of dorsal fin and highly arched and rounded body

    Ranchu Goldfish are highly valued and resilient despite their delicate nature. Adaptable to a variety of tankmates in clean water conditions, they make for ideal aquatic companions if kept in smaller aquariums. Noted for its rounded back and large head with fleshy features, the Ranchu Goldfish is an attractive addition to any home setup.

    9. Lionhead Goldfish

    Lionhead-Goldfish
    • Goldfish Type: Fancy
    • Adult Size: 6. 8 inches
    • Color Pattern: Various
    • Unique Traits: Known for its pronounced “wen” or head growth that covers the top of the head and gill plates

    The Lionhead Goldfish is a type of small fish distinguished by its exceptional raspberry-like protrusion atop the head. They are an interesting novelty to have in your aquarium, but not recommended for inexperienced aquarists since they require special care and attention.

    These particular goldfish guarantee to draw interest when guests come over, who can resist such unique creatures?

    10. Telescope Goldfish

    Black-moor-goldfish in aquarium
    • Goldfish Type: Fancy
    • Adult Size: 6. 8 inches
    • Color Pattern: Various
    • Unique Traits: Large protruding eyes that resemble telescopes

    The Telescope Goldfish, related to its comet goldfish family, is a resilient and adaptive small breed with big eyes that need extra attention. If youโ€™re looking for something new in your petite aquarium tank setup then the hardy telescope goldfish might be just what youโ€™re after! One thing to note is that they are one of the more delicate goldfish varieties due to their sensitive eyes.

    11. Fantail Goldfish

    Fantail-Goldfish
    • Goldfish Type: Fancy
    • Adult Size: 6. 8 inches
    • Color Pattern: Various
    • Unique Traits: Split caudal or tail fin that forms its fan shape

    Featuring a distinct, beautiful forked tail and round shape, the Fancy Tail Goldfish is sure to bring life and energy into any aquarium. Their sociability enables them to not only coexist with other fish, but thrive in their presence as well! Fantail Goldfish can be caught. Be kept on their own or even within groups of tankmates. making these lively creatures an ideal addition no matter what type of setup you choose.

    12. Oranda Goldfish

    Oranda-Goldfish
    • Goldfish Type: Fancy
    • Adult Size: 6. 8 inches
    • Color Pattern: Various
    • Unique Traits: Known for its wen that covers the head. Body is deep and rounded similar to a Ryukin

    Finally, the Oranda Goldfish is a fragile breed which has a protrusion on its head. Their tanks must be managed properly and they need compatible fish mates to stay healthy. As such, adding this ornate species to your little aquarium will undoubtedly give it sophistication.

    Other Considerations

    While these goldfish breed didn’t make the list, you can definitely consider them:

    • Celestial goldfish
    • Ryukin goldfish
    • Tosakin goldfish
    • Shubunkin goldfish (for outdoor ponds)

    Understanding Their Characteristics

    When diving into the depths of tiny goldfish breeds, itโ€™s like unearthing a trove of dazzling colors and captivating shapes. Among these aquatic jewels are two varieties. Slim-bodied and Fancy goldfish. known for their compatibility with small aquariums as well as distinct characteristics that make them stand out from other fish in this environment.

    Gallery-Of-Gold-fish

    From body shape to swimming habits, each breed has its own needs when being cared for. Yet all share attributes such as size appropriateness for aquaria, making it possible to appreciate different traits across multiple kinds of small goldfish breeds without taking up too much space!

    Size And Growth Potential

    The amazing thing about small goldfish breeds is their size and potential to grow. In spite of being so tiny for a goldfish they still get large for a freshwater fish.

    Their growth depends on tank maintenance, food quality and water conditions: thus providing an appropriate habitat is essential for these little fellowsโ€™ flourishing. Unfortunately enough, if those mini fish are held in confined aquariums, this could potentially stunt their development rate.

    Appearance And Color Patterns

    Goldfish breeds, especially those of small sizes, can be captivating in their diversity. Each has its own characteristics like the Celestial Goldfishโ€™s pointed eyes and tall head growth on an Oranda, long fins with a Veiltail breed, or delicate Bubble Eye goldfish pouches. All these features make them interesting to watch and visually appealing.

    In terms of coloration, we are presented with spectacles from metallic red to bright yellow as well as a range that goes from solid through calico patterns along all goldfish species, including Bubble Eyes, which stand out among other members of this family.

    Small goldfish have managed to maintain variety between each type due exclusively to their uniqueness when compared not only within different individual breeds but also throughout many varieties, showcasing multiple nuances that make them desirable for aquariums around the world!

    Care Requirements

    Small goldfish breeds demand more than just an aquarium and some food. Special attention is required for them to be healthy and grow properly. The quality of their living environment is essential in this matter. They must have at least 20 gallons of water, regular replacement with fresh treated H2O, a reliable filter system, and a suitable temperature (between 60ยฐF. 70ยฐF).

    Diet-wise, they should alternate between live foods, pellets plus flakes so that their health stays optimal alongside their spirits lifted, Common Goldfish might seem common but tending to these fish calls for exceptional care measures!

    Tank Setup and Maintenance

    Keep small goldfish breeds healthy and happy requires special care when setting up and managing their tank. From sizing the aquarium to maintaining water quality, there is a lot of planning involved in creating an ideal environment for your little fish friends.

    Your setup should include selecting proper filtration systems and decorations that wonโ€™t harm delicate creatures or cause potential dangers within the confines of your petโ€™s home. Itโ€™s important to monitor levels such as pH regularly throughout all stages of maintenance and adjustment – not just during setup!

    Tank Size Recommendations

    Itโ€™s best to provide a 20-30 gallon tank for your small goldfish, as this allows them ample room in which to swim and prevents overcrowding issues that could cause distress or illness. While you may initially think 10 gallons is sufficient, the larger size will prove more beneficial for their well being.

    Water Conditions And Filtration

    Caring for small goldfish means regularly checking water pH and ammonia levels, along with making sure that the temperature is in range of 68ยฐ to 74ยฐF. A reliable filter system should also be used to keep pollutants from accumulating and consequently harming aquatic life. Maintaining a balanced environment within these parameters helps ensure that your pet stays healthy throughout its lifetime.

    Decoration And Hiding Places

    Creating an environment conducive to your small goldfishโ€™s health requires more than just decorations. Offering secure and suitable hiding spots and selecting pleasing dรฉcor for the tank can make a world of difference for your little fish.

    Great For Delicate Fins!
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    Silk plants that are designed to be gentle on fish with fancy fins like Bettas and Fancy Goldfish

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    Including plants, rocks or maybe some fun accessories will not only give the aquarium an attractive look, but also be essential in creating a healthy habitat that is stimulating and comfortable for its inhabitant.

    Choosing Compatible Tank Mates

    When deciding on which tank mates to house with your small goldfish, it is as important as the size of the aquarium and monitoring water quality. Though these mini fish seem uncomplicated, choosing an inappropriate partner can cause distress and even lead to death. The following tips should help you select suitable companions for your little swimmers.

    Peaceful And Slow Swimming Fish

    When caring for small goldfish, it is wise to choose peaceful and slower-moving tank mates. These fish are not likely to fight with the Goldfish over food or space in the aquarium, making a healthy aquatic environment.

    Good companions include:

    All these species can live harmoniously together in one ecosystem when they meet basic requirements such as proper dieting and water parameters of pH level maintenance.

    Avoiding Aggressive Companions

    It is of the utmost importance to stay away from fish which display aggressive or quickly moving behaviour, as this could cause distress and injury for your small goldfish. Certain species like:

    With Betta Fish, the goldfish will actually harass and possibility even eat the Betta!

    Monitoring And Adjusting Tank Dynamics

    Goldfish are generally messy creatures and are hard on your bioload. Because of this, it’s important to monitor your tank parameters such as ammonia, nitrites, and nitrates.

    Other things to watch out for are pH and temperature. You can monitor your temperature with a thermometer or use an aquarium controller to keep your temperature stable. You can also use test kits to monitor the other parameters in your tank.

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    Summary

    While still large compared to other tropical fish available, it is possible to find smaller goldfish that you can place in a reasonably sized aquarium. If you want to keep a smaller tank, it is usually a better idea to opt for small fish instead. Either way, I have some FAQs to help you out on your journey.

    Frequently Asked Questions

    Is there a dwarf goldfish?

    A specific type of small-sized goldfish, Carassius praecipuus, native to central Laos, has recently been identified. This species can be distinguished by its diminutive size. With other varieties of the same fish.

    What is the smallest size goldfish tank?

    For the best possible environment for goldfish, it is recommended to obtain a 20-gallon tank at minimum. As they grow in size and number, you may need an even bigger aquarium such as one that holds 50 gallons of water or more, up to 100 gallon tanks are available.

    Itโ€™s important not to overlook how ammonia buildup can stress out fish living conditions. Hence, offering them enough space where they can thrive comfortably should be taken into consideration when setting up their home.

    What is the lifespan of a mini goldfish?

    Given the right environment, such as a pond or aquarium, mini goldfish have a potential lifespan of up to 20 years. If kept in an undersized bowl, their life expectancy is drastically reduced – usually only lasting 3-9 months due to poor water quality and space limitations.

    Can you buy small goldfish?

    You can purchase small goldfish from pet shops at different costs, with rarer species coming with a greater price tag. Prices of these fish may range anywhere between $5 and $100.

    How big do small goldfish usually get?

    Small goldfish breeds usually remain on the small side, typically reaching a size of 2-6 inches. Among them, Pompon Goldfish are especially miniature at an average length of only 5 inches. Consequently, they donโ€™t get very big in general.

  • 15 Fish That Look Like Snakes: My Picks From 25 Years in the Hobby

    15 Fish That Look Like Snakes: My Picks From 25 Years in the Hobby

    Snake-like fish are one of those categories that genuinely surprises new hobbyists. the variety out there is wild, and they add a completely different visual element to any tank. Of the fish on this list, moray eels are the ones I’ve personally kept over the years. They’re endlessly fascinating but come with their own unique demands. If you’re drawn to the elongated, serpentine look, there are options here for every skill level and tank setup. but keep one rule in mind across almost all of them: always cover your tank.

    Key Takeaways

    • Most snake like fish species are eel shaped fish that are found in both; freshwater habitats and saltwater habitats.
    • Most species of snake looking fish including Zebra moray and Snakeheads are medium to large sized fish and are agggressive
    • There are smaller peaceful fish like the Kuhli Loach that work in community thank

    15 Fish That Look Like Snakes

    1. Kuhli Loach

    Kuhli Loach
    Kuhli Loach

    Kuhli Loaches are hardy bottom-dwelling fish. Nocturnal in nature. Gets along with many fish and tolerate of coldwater environments

    Click For Best Price
    • Scientific Name: Pangio kuhlii
    • Difficulty Level: Easy 
    • Temperament: Peaceful and sociable 
    • Adult Size: 3 to 5 inches
    • Minimum Tank Size: At least 20 gallons for 3 to 5 individuals 
    • Diet: Omnivores 
    • Origin: Southeast Asia
    • Temperature: 75ยฐF to 82ยฐF

    The reason why I put Kuhli Loaches in the first place is because their slender body looks exactly like a snake. Despite their body shape, their behavior tends to be like a snake because they are nocturnal, active, and super sneaky creatures.

    Kuhli Loaches are beginner friendly fish species that are hardy and easy to keep in a freshwater fish aquarium. Therefore, if you’re new to aquarium hobby, you should definitely pet these amazing creatures. 

    Make sure to add lots of hiding places and sandy, soft substrate to make them feel at home!

    ๐Ÿ† My Top Pick: If you want a genuinely snake-like fish that won’t cause trouble in a community tank, the Kuhli Loach is where I’d start. They’re peaceful, hardy, and beginner-friendly. and their slender, banded body makes them one of the most convincingly snake-like fish you can keep alongside other species. Just do your research on tank mates and keep them with calm, non-aggressive fish.

    2. Rope Fish

    • Scientific Name: Erpetoichthys calabaricus
    • Difficulty Level: Intermediate 
    • Temperament: Peaceful and sociable 
    • Adult Size: 2 feet 
    • Minimum Tank Size: 50 gallons
    • Diet: Carnivores
    • Origin: West & Central Africa
    • Temperature: 73ยฐ to 82ยฐF

    The Rope fish, commonly known as the Reedfish or snake fish, looks like a combo of fish, eel, and snake. Like a snake, the Rope fish can live inside and outside of water because it possesses lungs. Like eels and snails, they have long cylindrical bodies with dorsal finlets that resemble a rope. 

    They get large reaching around 20 inches with a maximum size of around 36 inches. Therefore, you need a large size tank mainly because of their nocturnal leaping activities. 

    โš ๏ธ Universal Warning for This Entire List: Almost every fish on this list is an escape artist. Kuhli Loaches, Rope Fish, Fire Eels, Tire Track Eels. they will find any gap in your lid and be on the floor by morning. This is the most common way hobbyists lose these fish. Always use a tight-fitting lid with no gaps around heaters, filters, or air lines. This is non-negotiable with any eel-bodied species.

    3. Fire Eel

    Fire-Eel
    • Scientific Name: Mastacembelus Erythrotaenia
    • Difficulty Level: Difficult 
    • Temperament: Semi-aggressive 
    • Adult Size: 20 to 40 inches 
    • Minimum Tank Size:
    • Diet: Omnivores 
    • Origin: Southeast Asia
    • Temperature: 24-28โ„ƒ

    Contrary to its name, the Fire eel is not a true eel. They are one of the most common freshwater fish species with protruding snouts as eels. Mostly, they gain their popularity because of their unique color and big size, reaching around 40 inches in length.

    Like a snake, they have those creepy sneaky vibes with no abdominal fins on their long cylindrical bodies with dark brown or gray color. 

    Though they rarely bite, Fire eels are particularly dangerous because of their spines and toxins. Therefore, proper caution and care are essential, especially with kids.

    4. Snakeskin Discus

    Snakeskin-Discus
    • Scientific Name: Symphysodon spp.
    • Difficulty Level: Difficult
    • Temperament: Semi-aggressive
    • Adult Size: 6 to 8 inches
    • Minimum Tank Size: 50 gallons
    • Diet: Omnivores
    • Origin: South America 
    • Temperature: 82-88ยฐF

    A gift of selective breeding, the Snakeskin discus looks nothing like a snake. However, their spotted appearance with thin striations and intricate scale patterns resembles the skin of snakes. Hence, the name.

    With a beautiful and eye catching appearance and a peaceful nature, the coloration varies with Snakeskin Discus. red, brown, and blue, which all are phenomenal looking. Therefore, Snakeskin Discus makes a fitting choice for many aquarium enthusiasts. 

    However, they have special requirements to meet for their happy and healthy survival. Thus, maintaining the water quality and temperature is essential. Check out my discus guide for more tips on how to properly keep them.

    5. Tire Track Eel

    • Scientific Name: Mastacembelus Favus
    • Difficulty Level: Intermediate
    • Temperament: Semi-aggressive
    • Adult Size: 28 inches
    • Minimum Tank Size: 80 gallons
    • Diet: Carnivores
    • Origin: Riverine fauna of India, Bangladesh, Pakistan, and Sri Lanka.
    • Temperature: 72-82ยฐF

    Long cylindrical bodies, irregular dark brown patterns, and zig zag markings with snout-like faces with no pelvic fins make the Tire Track Eel a fitting match for a snake. 

    Also known as the ZigZag Eel or Reticulated Spiny Eel, they are a popular freshwater aquarium fish with shy and timid personalities. Mostly active during the night time, the Tire Track Eels are usually found burrowing in the substrate and other decors. 

    Therefore, choosing a sandy and soft substrate with lots of tank decors, such as large pieces of driftwood, smooth rock caves, PVC pipes, and plant thickets, are essential to keep them happy and healthy. 

    6. Snakeskin Barb

    • Scientific Name: Puntius rhomboocellatus
    • Difficulty Level: Intermediate
    • Temperament: Semi-aggressive
    • Adult Size: 2 inches
    • Minimum Tank Size: 60-gallon tank
    • Diet: Omnivores 
    • Origin: Borneo, Indonesia
    • Temperature: 73 to 82 degrees Fahrenheit

    At first glance, you will not relate Snakeskin barb to snakes. However, upon careful observation, you’ll notice that Snakeskin Barbs have Python like markings all over their bodies that earn the name. 

    The Snakeskin barbs are barb fish that are relatively small fish and thrive in a group of 6 to 8 fish species. 

    They are an ideal choice for experienced aquarists who appreciate some mid and upper level activities in their freshwater fish aquarium.

    7. Northern Snakehead fish

    • Scientific Name: Channa Argus
    • Difficulty Level: Difficult
    • Temperament: Aggressive, predatory 
    • Adult Size: 40″ long
    • Minimum Tank Size: 500 gallons
    • Diet: Carnivores 
    • Origin: China, Southern Siberia, and North Korea
    • Temperature: 41 to 60ยฐ F

    Northern snakehead fish is named after the snake like head shape that hunts in packs. Northern snake eels are one of the largest freshwater habitats that are usually found in cool waters and can endure massive temperature changes ranging from 32ยฐ to 85ยฐF, which is insane1.

    However, they are legally banned in the United States, Europe, and Australia, so you need a special permit to own one in your home aquarium. 

    8. Senegalus Eel 

    Bichir
    • Scientific Name: Polypterus senegalus
    • Difficulty Level: Intermediate 
    • Temperament: Semi-aggressive 
    • Adult Size: 20 inches
    • Minimum Tank Size: 90 gallons
    • Diet: Carnivore 
    • Origin: Egypt, Kenya, Nigeria, and Senegal
    • Temperature: 75-82ยฐ F

    If you’re someone who’s obsessed with snakes and dinosaurs, you should definitely check out the Senegalus Eel, also commonly known as the Dinosaur Bichir.

    Dinosaur Bichirs are large sized fish that require a tank size of a minimum 90 gallons. However, if your Senegalus Eel is a juvenile, you can keep it in a 40 gallon tank and upgrade later. However, make sure to provide them with optimal water conditions and a varied diet that compliments their active nature. 

    9. Cobra Guppy 

    Cobra Guppies
    • Scientific Name: Poecilia reticulata
    • Difficulty Level: Easy
    • Temperament: Peaceful and easy going 
    • Adult Size: 2 to 3 inches
    • Minimum Tank Size: 10 gallons
    • Diet: Omnivores 
    • Origin: Northeast South America
    • Temperature: 70ยฐF to 81ยฐF

    When it comes to exotic freshwater fish, cobra guppies are one of the fanciest and most beautiful exotic fish you’ll ever find. The coloration varies from Red to yellow, blue, white, black, Albino and blue, and Gold. Each one is beautiful in its own unique way. 

    These guppy fish get their name because of their distinctive body markings that resemble the hood of a cobra. Since they are hardy fish that are also active swimmers, they are excellent for beginner aquarists as long as you provide them with a well maintained aquarium with a good oxygen supply and water quality. 

    10. Pipefish

    Pipefish
    • Scientific Name: Syngnathinae
    • Difficulty Level: Difficult 
    • Temperament: Depends on species 
    • Adult Size: 8 inches
    • Minimum Tank Size: 30 Gallons
    • Diet: Carnivore 
    • Origin: Atlantic and Pacific Oceans
    • Temperature: 72.0 to 77.0ยฐ F
    • Reef Safe: Depends on species
    • Available As Tank Bred: Yes

    Pipefish look more like seahorses than snakes with an extraordinary ability to camouflage in the background of their environment. 

    The long snouts and bony rings around their bodies make them unique looking fish that change color to blend in with their surroundings. 

    Though, smaller in size than other average marine creatures, Pipe fishes are difficult to keep and require an experienced aquarist’s skills for a better life. Therefore, if you’re a beginner, Pipe fish are not recommended.

    11. Moray Eel 

    Morary Eel In Tank
    • Scientific Name: Gymnothorax kidako
    • Difficulty Level: Intermediate 
    • Temperament: Large, aggressive, predatory
    • Adult Size: 39.4 inches
    • Minimum Tank Size: 160 Gallons
    • Diet: Carnivore 
    • Origin: Western Central Pacific
    • Temperature: 66.0 to 78.0ยฐ F
    • Reef Safe: With caution (Requires specialized filtration and lighting equipment)
    • Available As Tank Bred: Yes

    Many people believe that eels are just sea snakes with gills. However, true aquarists know that eels are basically snake shaped fish that are a rare beauty in the aquarium hobby, just like the Moray eel.

    Frankly speaking. the Moray eel just looks like a cross between a snake and an eel with no pectoral fins or pelvic fins. Also, there are small holes in the elongated gill openings but they don’t possess any bony plate covers like most fish. They possess a continuous dorsal fin and anal fin but no scales. 

    However, if you’re willing to keep a Moray eel, make sure to provide plenty of space. They get large and are aggressive. They are a better fit for experienced hobbyists.

    12. Bichir

    • Scientific Name: Polypterus bichir
    • Difficulty Level: Intermediate 
    • Temperament: Semi-aggressive
    • Adult Size: 1 to 2.5 feet
    • Minimum Tank Size: 90 gallons
    • Diet: Carnivores 
    • Origin: Northeast Africa
    • Temperature: 74ยฐF to 82ยฐF

    Bichirs are one of the most fantastic fish that are ancient and add a very sophisticated appeal to your tank. 

    In fact, it is one of my favorite larger sized fish that looks like a snake. 

    Granted, they come from shallow water, their eyesight is terrible and they have to rely on other senses to navigate properly and find food. 

    One of the most interesting features of Bichirs is the presence of lungs that allow them to come to the water’s surface to get oxygen. While easy to keep, Bichirs are very hard to breed.

    13. Banded Snake Eel (Ophichthidae)

    • Scientific Name: Myrichthys colubrinus
    • Difficulty Level: Easy
    • Temperament: Somewhat aggressive
    • Adult Size: 4 feet
    • Minimum Tank Size: 150+ gallons tank
    • Diet: Small fishes, crabs and shrimps
    • Origin: Indo-Pacific
    • Temperature: 82 ยฐF
    • Reef Safe: Yes
    • Available As Tank Bred: Yes

    Snake eels stay true to their name by the way they burrow very fast with the tips of their tails just like a snake. As nocturnal as they are, they remain hidden during the day in the soft substrate and come out at night to hunt. 

    Maintenance wise, they are easy to keep and feed. Just provide them with optimal normal saltwater fish parameters including pH, saliny, temperature, and water movement, and they are good to go!

    14. Snakeskin Gourami

    Snakeskin Gourami
    • Scientific Name: Trichopodus pectoralis
    • Difficulty Level: Easy
    • Temperament: Peaceful
    • Adult Size: 9.8 inches
    • Minimum Tank Size: 35 Gallons
    • Diet: Omnivore 
    • Origin: Asia
    • Temperature: 72.0 to 86.0ยฐ F

    The Snakeskin Gourami might not be the most common freshwater fish as other fish in the Gourami family, but the scales and patterns on their bodies bear a striking resemblance to that of a snake. 

    In their native land, they are sought after as a good food fish and cultivated for purpose. However, in the aquarium hobby, they are one of the more peaceful gourami fish that are hardy and easy to breed. Hence, perfect for beginner aquarists. 

    15. Orangethroat Pikeblenny

    • Scientific Name: Chaenopsis alepidota
    • Difficulty Level: Easy
    • Temperament: Peaceful
    • Adult Size: 6 inches
    • Minimum Tank Size: 20+ gallons tank
    • Diet: Small fish, crustaceans
    • Origin: Eastern Pacific Ocean
    • Temperature: 82.4 ยฐF
    • Reef Safe: Yes
    • Available As Tank Bred: Yes

    The Orangethorat Pikeblenny is one of the hardiest saltwater fish that looks like and is found in coastal shallows.

    In the aquarium hobby, they are hardy fish species that should be kept with other peaceful tank mates with lots and lots of hiding places.

    However, make sure to house only one Pikeblenny in an aquarium. They will fight amongst members of their own species.

    Fun Fact: An Orangethroat PikeBlenny (Chaenopsis alepidota), displays its colors to attract a mate.

    FAQS

    Final Thoughts

    Snakes are sneaky little creatures that are curious and confident. No wonder why many people insist on keeping snakes as pets. 

    If you’re a seasoned aquarist who loves snakes but cannot keep them as pets, you can definitely go for any snake like fish from the list above and have fun with them!