What vegetables can I feed my fish?

Tropical fish love most vegetables! But every fish will have its own appetite. The best veggies to feed fish include lettuce, peas, zucchini, and cucumber. These can be given raw or frozen as long as they are prepared and thawed before serving.

Can I feed my fish fruits?

While fruits can be blanched and stored for serving later, it’s not recommended to give fruits to fish. This is because fruit is high in sugar, which can easily start to affect aquarium water. Because of this, it’s generally recommended to only give fish vegetables.

How do I make prepared fish foods?

Feeding vegetables to fish is quick and easy! Depending on the type of veggie you’re giving, you may need to cut it up into small pieces. These pieces can then be washed and added directly to the tank or blanched and saved for later.

Why didn’t my fish eat vegetables?

Every fish is different and yours might not enjoy vegetables! Instead, you can supplement those vitamins and minerals with algae wafers or pellets.

How do I make prepared fish foods?

Feeding vegetables to fish is quick and easy! Depending on the type of veggie you’re giving, you may need to cut it up into small pieces. These pieces can then be washed and added directly to the tank or blanched and saved for later.

Why didn’t my fish eat vegetables?

Every fish is different and yours might not enjoy vegetables! Instead, you can supplement those vitamins and minerals with algae wafers or pellets.

Can saltwater fish eat vegetables?

Yes! Saltwater fish can also be given vegetables even though they’re unlikely to experience plant matter in their natural habitats. Because of this, saltwater fish are more likely to ignore vegetable offerings, but some might take a nibble. Instead, saltwater fish can be offered different types of macroalgae and seaweed sheets. The most common type of veggie before Nori was popular was romaine lettuce.

What fish can you keep with a zebra danio?

There are many fish that can be kept with zebra danios, but small tetras, rasboras, catfish, and loaches are some of the best choices! When picking a new fish for your zebra danio tank, water temperature and activity levels are the main factors to take into consideration.

How many zebra danios should be kept together?

These danios need to be kept in groups of at least 6 or more. Keeping less than this can cause individuals to become stressed out and reclusive. This might even lead to a premature death.

Are zebra danios good community fish?

Yes! Zebra danios are some of the best community fish available. These fish are extremely hardy and can be kept with most community species.

Are danios fin nippers?

Zebra danios can be fin nippers. It’s best to avoid long-finned tank mates or to increase the size of the school instead. This should help diffuse possible aggression.

Can danios go in a tropical tank?

Yes, zebra danios can be slowly acclimated to a warmer tank even though they prefer cooler temperatures.

How long does a pet fish live?

Depending on the species, most pet fish with live between 1 and 15 years with good care. The average nano fish will live between 3 and 5 years, while medium fish species have longer lifespans in the 5-15 year range.

How long do fish live naturally?

Fish in the wild probably live shorter lifespans than captive fish because they are exposed to more predators and dangerous environmental factors like floods, droughts, and cold snaps. Captive fish can live a surprisingly long life if kept in a clean tank with stable conditions and a high-quality diet.

Which fish species has the shortest lifespan?

According to the Guinness Book of Records, the fish with the shortest lifespan is the seven-figure pygmy goby. These tiny saltwater fish complete their entire life cycle in less than two months! In the aquarium hobby, livebearers like guppies and platies tend to have shorter lifespans than similar-sized egg layers like the neon tetra. The average guppy has a lifespan of just two to three years.

Which fish live the longest?

The longest-living fish species is the Greenland shark, a species of deep, cold waters in the open ocean. These huge sharks can reach about 23 feet and live for over 400 years! This is one fish you probably don’t want in your home aquarium.

Which fish has the longest lifespan?

Goldfish are about the longest-living aquarium fish species, and some specimens will live over 25 years with proper care. Koi can live even longer, although these beautiful fish from the carp family are usually housed outdoors in ponds. Their average lifespan is about 25 to 30 years, although one incredible specimen called Hanako is said to have lived for 226 years!

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. It’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 don’t get very big in general.

What does a fish-in cycle mean?

A fish-in cycle means that fish are present in the tank during the initial nitrogen cycle. This is often a fishless process as fish depend on beneficial bacteria to make the aquarium safe; fish produce toxic ammonia, nitrite, and nitrate that need to be processed by bacteria for safe conditions. Fish-in cycles were once a popular method due to a lack of research and bad information. Information about the aquarium industry and husbandry was difficult to come by, and many store employees were–and still are–uneducated about the true process.

How long should a fish-in cycle take?

A fish-in cycle can take a week but it can also take two months. How long your tank takes to cycle will depend on how quickly your bacteria can grow, which varies from tank to tank. A fish-in cycle should be fast but as thorough as possible; while you want conditions to be safe as soon as possible, you also want to give your bacteria time to grow and colonize the aquarium for future stability. In general, a fish-in cycle can become a ‘ghost’ cycle in as little as a week, especially if it is a heavily planted aquarium. A ghost cycle is when the nitrogen cycle is happening in the aquarium, but goes undetected due to ammonia, nitrite, and nitrate being processed faster than can be tested. As mentioned above, plants take up nutrients, decreasing their presence in the tank water. This can make it seem like it’s a fully cycled tank, but the process is still happening.

Can I add fish during cycling?

It is not recommended to add fish during a cycle, but you might find yourself in this scenario. Check water parameters, change water as necessary, add only a few fish at a time or stop entirely, make feeding adjustments, add plants, and dose bottled bacteria.

Which fish are best for cycling?

If you must add fish to a new tank, then it’s best to add extremely hardy species, like danios, guppies, and platys.

Should I do water changes during a fish-in cycle?

Yes! Water changes are the best way to keep parameters in check at any stage of a new tank. Especially in a fish-in cycle, testing water parameters and performing water changes as necessary to keep ammonia, nitrite, and nitrate levels down may just be what keeps your fish alive.

What fish can live in a one-gallon tank?

Pretty much any small fish can survive in a 1-gallon tank for as long as you can maintain suitable water quality. However, a one-gallon tank is really too small for the long-term care of any fish species, especially if you care about the welfare of your pets.

Can a betta live in a 1-gallon tank?

Betta fish will survive in a one-gallon fish tank, although they will be very cramped and difficult to care for in the long-term. A five-gallon aquarium is the minimum recommended size for a betta fish tank.

How many guppies can live in a 1-gallon tank?

You could keep a single male guppy in a 1-gallon aquarium, although it would be much better to keep a small group of five or six in a decent 15-gallon tank with filtration and heating.

What is the best fish for a small aquarium?

Each fish keeper has their own favorite small fish species, but I do not recommend keeping any freshwater aquarium fish in a tank size smaller than 5 gallons. This tank size will make a great home for bettas and killifish. Step up to a 15-gallon aquarium to keep even more fish like small tetras, rasboras, and honey gouramis. At this tank size, you can even keep a small community and observe the interesting behavior of happy schooling fish!

Can 2 goldfish live in a 1-gallon tank?

Goldfish need a surprisingly large aquarium for long-term survival. A pair of adult goldfish requires at least 30 gallons, so a 1-gallon tank or bowl just isn’t going to work!

Can snails live in a 1-gallon tank?

Like all aquatic creatures, snails produce waste that can accumulate and affect water quality. Many aquarium snail species are very hardy, but you’d still need to clean their tank regularly and perform a few water changes each week to keep their water quality high. Small species like bladder snails could be an interesting option for a 1-gallon aquarium.

Tag: Freshwater

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

Small does not mean easy. That’s the one thing I want people to understand before they buy their first nano fish. I’ve kept chili rasboras, pea puffers, and pygmy corydoras, and I’ve worked with virtually every fish on this list during my years managing fish stores. The smallest fish in the trade are often the most demanding in terms of water stability and appropriate tank setup. A chili rasbora in bad water is not a hardy fish. It’s a dead fish.

Here’s the other thing people consistently get wrong: tank size. Small fish don’t mean small tanks. A group of nano fish still needs appropriate space and, more importantly, a stable environment. Parameter swings that a guppy shrugs off will kill a 0.75-inch chili rasbora. I push everyone toward a 10-gallon minimum for any nano species, and bigger is always better.

Expert Take | Mark Valderrama, AquariumStoreDepot

The smallest fish need the most stable water. That’s not counterintuitive once you think about it: a small body has almost no buffer against a parameter swing. A 10-gallon tank with weekly water changes and a mature filter is the minimum for any of these species. If you’re eyeing a 5-gallon for a chili rasbora, go 10. You’ll have more success and the fish will actually thrive instead of just surviving.

ASD Nano Fish Difficulty Tiers

Tier 1 (Beginner Nano): Pygmy corydoras, ember tetra, endler’s livebearer, least killifish. Hardy, adaptable, forgiving of minor mistakes. Good for first nano setups.

Tier 2 (Intermediate Nano): Chili rasbora, green neon tetra, celestial pearl danio, white cloud minnow. Need stable parameters and appropriate tank setup to thrive. Rewarding when done right.

Tier 3 (Specialist Only): Exclamation point rasbora, dwarf pygmy goby, pea puffer. Challenging to source, requiring very specific conditions or behavioral management.

The 21 Smallest Aquarium Fish in the Trade

1. Chili Rasbora

Scientific Name: Boraras brigittae
Adult Size: 0.75 inches (2 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 68 to 82°F (20 to 28°C)
pH: 4.0 to 7.0
Group Size: 10+

The chili rasbora is one of the most visually striking nano fish in the hobby, but it’s not a beginner fish. It needs soft, acidic water, a heavily planted tank, dark substrate, and a group of at least 10. In the right setup, the males light up bright red. In the wrong setup (hard water, bright light, small group), they fade, stress, and decline. Build the tank for the fish first. Then add the fish.

Mark’s Pick

For a dedicated nano planted tank, chili rasboras in groups of 15 to 20 are my favorite pick. They’re stunning when the setup is right, and that setup isn’t complicated: dark substrate, heavy plants, soft water, and patience. Get the tank running for 2 months before adding them.

2. Green Neon Tetra

Scientific Name: Paracheirodon simulans
Adult Size: 1 inch (2.5 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 75 to 82°F (24 to 28°C)
pH: 4.0 to 6.5
Group Size: 10+

The green neon tetra is the smallest of the three Paracheirodon tetras (neon, cardinal, green neon) and the most demanding. It lives in blackwater habitats with very soft, acidic water and does not adapt well to harder, alkaline tap water. In a blackwater setup with dark substrate and tannins, a group of 15 or more produces a genuinely electric display. This is not a fish for standard community tanks.

3. Celestial Pearl Danio (Galaxy Rasbora)

Scientific Name: Danio margaritatus
Adult Size: 1 inch (2.5 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 73 to 79°F (23 to 26°C)
pH: 6.5 to 7.5
Group Size: 8+

Discovered in 2006 in a small pool in Myanmar, the celestial pearl danio caused a collecting frenzy that briefly threatened wild populations. It’s widely tank-raised now and fully established in the hobby. Pearl-spotted body, orange-red fins, compact schooling behavior. Males display and compete with each other without causing real damage. Keep a higher female ratio to prevent constant male harassment. Excellent for a planted nano tank with stable parameters.

4. Pygmy Corydoras

Scientific Name: Corydoras pygmaeus
Adult Size: 1 inch (2.5 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 72 to 79°F (22 to 26°C)
pH: 6.0 to 8.0
Group Size: 8+

The pygmy corydoras is the smallest corydoras species commonly available and one of the few that schools mid-water as well as near the bottom. They’re peaceful, hardy relative to other nano fish, and endlessly active. Keep a group of at least 8. They’re social fish that genuinely need each other’s company to behave normally. Alone or in small groups, they become stressed and inactive.

5. Ember Tetra

Scientific Name: Hyphessobrycon amandae
Adult Size: 0.8 inches (2 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 73 to 84°F (23 to 29°C)
pH: 5.0 to 7.0
Group Size: 8+

The ember tetra is a deep orange nano fish that thrives in planted tanks with dark substrate. It’s peaceful, stays small, and is more accessible than chili rasboras in terms of both availability and care. The color is at its best in soft, warm water with a dark background and heavy planting. A group of 10 or more against a backdrop of green plants is a legitimately beautiful setup.

6. Least Killifish

Scientific Name: Heterandria formosa
Adult Size: 0.8 to 1.4 inches (2 to 3.5 cm); females larger
Min Tank Size: 5 gallons (19 L)
Temperature: 65 to 80°F (18 to 27°C)
pH: 7.0 to 8.0
Group Size: 6+

The least killifish is actually a livebearer, not a true killifish, and it holds the distinction of being one of the smallest vertebrates in North America. It’s native to the southeastern United States, tolerates a wide range of temperatures including unheated tanks, and reproduces readily. Population control is the main concern: they breed constantly and a small colony will multiply quickly. Great option for a species-only 5 to 10-gallon setup.

7. Endler’s Livebearer

Scientific Name: Poecilia wingei
Adult Size: 1 to 1.8 inches (2.5 to 4.5 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 72 to 82°F (22 to 28°C)
pH: 7.0 to 8.5
Group Size: 6+

Endler’s livebearers are small, colorful, and one of the hardiest nano fish available. Males display vivid neon patterns and are constantly active. They breed readily, so plan for population management. Keep males only for a display tank without breeding, or use a heavily planted tank to give fry hiding spots if you want a self-sustaining colony. They’re more robust than chili rasboras or green neon tetras and tolerate harder water better.

8. White Cloud Mountain Minnow

Scientific Name: Tanichthys albonubes
Adult Size: 1.5 inches (4 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 60 to 72°F (15 to 22°C)
pH: 6.0 to 8.0
Group Size: 6+

White cloud mountain minnows are a cold-water option for hobbyists who don’t want or can’t maintain a heated tank. They’re extremely hardy, school reliably, and have been in the hobby for decades. The only requirement that trips people up is temperature: they don’t do well above 75°F (24°C) for extended periods. In cooler conditions, they’re nearly indestructible and one of the best schooling nano fish for the category.

9. Exclamation Point Rasbora

Scientific Name: Boraras urophthalmoides
Adult Size: 0.75 inches (2 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 72 to 82°F (22 to 28°C)
pH: 4.0 to 7.0
Group Size: 10+

Named for the exclamation-mark-shaped marking on their flank, these tiny fish are closely related to chili rasboras and have similar care requirements. They prefer soft, acidic water and heavy planting. Not as widely available as chili rasboras but sought out by nano tank enthusiasts who want something slightly different. Same care approach: mature tank, dark substrate, large group.

10. Sparkling Gourami

Scientific Name: Trichopsis pumila
Adult Size: 1.5 inches (4 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 72 to 82°F (22 to 28°C)
pH: 6.0 to 7.5
Group Size: Pairs or small groups

The sparkling gourami is a labyrinth fish that can produce audible sounds during courtship. That’s not marketing: they actually click and purr. They’re stunning up close with iridescent blue spots and red-edged fins. Keep in small groups in a heavily planted tank. Males are competitive but not destructively aggressive. Not a schooling fish, but an excellent nano centerpiece species for tanks where chili rasboras need a companion species.

11. Pea Puffer (Dwarf Puffer)

Scientific Name: Carinotetraodon travancoricus
Adult Size: 1 inch (2.5 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 77 to 82°F (25 to 28°C)
pH: 6.5 to 8.0
Group Size: 1 per 10 gallons, or colony with caution

The pea puffer is tiny, bold, and predatory in a way that most people don’t anticipate. It will hunt snails and attack the fins of slower tank mates. It is not a community fish. I kept pea puffers and the level of hunting behavior they display is remarkable for a 1-inch (2.5 cm) fish. They work best in a species-only setup or with very fast, short-finned tank mates. Males establish territories and will fight, so plan space carefully.

12. Norman’s Lampeye Killifish

Scientific Name: Aplocheilichthys normani
Adult Size: 1.3 inches (3.5 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 72 to 80°F (22 to 27°C)
pH: 6.0 to 8.0
Group Size: 8+

The lampeye killifish has iridescent blue eyes that catch light beautifully. It’s an active, peaceful schooling fish that works well in community nano tanks. Not as commonly available as tetras and rasboras, but worth seeking out. Adaptable to a wide pH range and not as demanding as the Boraras species. A good choice for hobbyists who want something less common.

13. False Rummynose Rasbora (Brilliant Rasbora)

Scientific Name: Rasbora borapetensis
Adult Size: 2 inches (5 cm)
Min Tank Size: 20 gallons (76 L)
Temperature: 73 to 81°F (23 to 27°C)
pH: 6.0 to 7.5
Group Size: 8+

Sometimes sold as the brilliant rasbora, this species produces tight schooling behavior similar to the rummy nose tetra but in a more forgiving package. The red tail and black stripe make it visually interesting. Hardy, peaceful, and a reliable community fish for planted tank setups. Not as compact as the nano fish on this list but a useful bridge species for hobbyists moving from nano to community tanks.

14. Licorice Gourami

Scientific Name: Parosphromenus deissneri
Adult Size: 1.5 inches (4 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 72 to 82°F (22 to 28°C)
pH: 4.0 to 6.5
Group Size: Pairs

The licorice gourami is a specialist species for soft, acidic blackwater tanks. Males are stunning in breeding condition with vivid blue striping. They’re not commonly available and require very specific water parameters. For the dedicated nano blackwater hobbyist, they’re a rewarding species. For everyone else, they’re too demanding to recommend without the right setup already in place.

15. Pygmy Hatchetfish

Scientific Name: Carnegiella myersi
Adult Size: 1 inch (2.5 cm)
Min Tank Size: 15 gallons (57 L)
Temperature: 73 to 81°F (23 to 27°C)
pH: 5.5 to 7.0
Group Size: 8+

Pygmy hatchetfish occupy the top 2 inches (5 cm) of the water column almost exclusively. They’re surface-dwelling schoolers that need a tight-fitting lid: they jump, especially when startled. In a planted tank with floating plants and a secure lid, they produce interesting movement near the surface and don’t compete for space with bottom and mid-level species. Soft, slightly acidic water is required.

16. Strawberry Rasbora

Scientific Name: Boraras naevus
Adult Size: 0.75 inches (2 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 68 to 79°F (20 to 26°C)
pH: 5.0 to 7.0
Group Size: 10+

The strawberry rasbora is a close relative of the chili rasbora with orange-red spots on a translucent body. Less commonly available but sought out by nano tank specialists. Same care requirements as the chili: soft acidic water, heavy planting, dark substrate, large group. A species worth tracking down if you’re building a dedicated blackwater nano setup.

17. Mosquito Rasbora

Scientific Name: Boraras brigittae (same as chili; some use for B. merah)
Adult Size: 0.75 inches (2 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 70 to 82°F (21 to 28°C)
pH: 4.0 to 7.0
Group Size: 10+

The name “mosquito rasbora” is sometimes applied to Boraras merah, a close relative with orange-red body coloration and a black spot near the tail. Care is nearly identical to chili rasboras. Like all Boraras species, they need stability: parameter swings, inappropriate water hardness, or insufficient group size will cause them to fade and decline. In the right setup, they’re excellent nano fish.

18. Clown Killifish

Scientific Name: Epiplatys annulatus
Adult Size: 1.5 inches (4 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 72 to 80°F (22 to 27°C)
pH: 5.5 to 7.5
Group Size: Pairs or small groups

The clown killifish is a striking surface-dwelling nano fish with blue and yellow striped fins. Males are bolder in coloration. They need floating plants to feel secure and will stay near the surface. They’re not commonly available but are well-suited to a dedicated nano killifish setup. Peaceful with fish too large to be eaten, but will consume very small fry and invertebrates.

19. Green Kubotai Rasbora

Scientific Name: Microdevario kubotai
Adult Size: 0.75 inches (2 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 68 to 78°F (20 to 26°C)
pH: 6.5 to 7.5
Group Size: 10+

The green kubotai rasbora is a tiny, neon-yellow-green nano fish that stands out in a planted aquarium. It’s more forgiving of neutral pH than Boraras species, making it slightly more accessible for average tap water. Active schooler, peaceful, and visually unique. Availability can be inconsistent but it’s worth seeking out for a planted nano setup.

20. Scarlet Badis

Scientific Name: Dario dario
Adult Size: 0.8 inches (2 cm)
Min Tank Size: 10 gallons (38 L)
Temperature: 71 to 79°F (22 to 26°C)
pH: 6.5 to 7.5
Group Size: 1 male per tank, or species only with more females

The scarlet badis is one of the most colorful micro fish in the hobby: vivid red and blue striping on males. It’s also one of the fussiest feeders. Most specimens reject dry food and require live or frozen micro prey like daphnia, baby brine shrimp, or micro worms. Males are highly territorial with each other. In a well-planted 10-gallon with a single male and 2 to 3 females, they’re a stunning display fish. Not for beginners.

21. Dwarf Pygmy Goby

Scientific Name: Pandaka pygmaea
Adult Size: 0.35 to 0.45 inches (8 to 11 mm)
Min Tank Size: 5 gallons (19 L)
Temperament: Peaceful

The dwarf pygmy goby holds one of the claims to the world’s smallest fish title. It’s a Philippine species that moves between freshwater and brackish conditions. Critically endangered, extremely rare in the trade, and barely found outside of specialty sources near its native range. Listed here for completeness. This is not a fish you’ll find at your local fish store.

Nano Fish Comparison at a Glance

Fish	Max Size	Min Tank	Difficulty	Best Setup
Chili Rasbora	0.75 in (2 cm)	10 gal (38 L)	Intermediate	Planted blackwater
Green Neon Tetra	1 in (2.5 cm)	10 gal (38 L)	Intermediate	Soft acidic planted
Celestial Pearl Danio	1 in (2.5 cm)	10 gal (38 L)	Easy-Moderate	Planted community
Pygmy Corydoras	1 in (2.5 cm)	10 gal (38 L)	Easy	Any planted tank
Ember Tetra	0.8 in (2 cm)	10 gal (38 L)	Easy	Planted nano
Pea Puffer	1 in (2.5 cm)	10 gal (38 L)	Species-only	Dedicated puffer tank
Endler’s Livebearer	1.8 in (4.5 cm)	10 gal (38 L)	Easy	Community or species
Scarlet Badis	0.8 in (2 cm)	10 gal (38 L)	Advanced	Species-only, live food

What People Get Wrong About Nano Fish

The biggest mistake is equating small body size with easy care. The chili rasbora and green neon tetra are among the most parameter-sensitive fish in the hobby. A beginner who drops them into a new 5-gallon tank will lose them within a month. Small fish have almost no buffer against water quality swings. A mature filter, stable temperature, and appropriate water chemistry are not optional.

The second mistake is understocking. A group of 4 chili rasboras in a 10-gallon is not a thriving nano tank. It’s a stressed group of fish that will fade in color, hide constantly, and decline. The minimum group sizes listed above are not suggestions. They’re the floor.

The third mistake is overstocking because the fish are small. A 10-gallon tank housing 30 nano fish is overcrowded regardless of body size. Bioload is real. Keep the stocking modest and the water changes consistent.

Avoid If…

Your tank is under 10 gallons and you want more than 1 species of nano fish
Your tap water is very hard and alkaline (above 8.0 pH) and you want Boraras species
You’re not committed to buying the full minimum group size
You’re adding sensitive species (chili rasbora, green neon) to a tank under 3 months old
You want to mix pea puffers with anything slow-moving or long-finned

FAQs

What is the smallest aquarium fish you can actually buy?

For practical purposes, the chili rasbora (Boraras brigittae) and exclamation point rasbora (Boraras urophthalmoides) at 0.75 inches (2 cm) are among the smallest commonly available aquarium fish. The dwarf pygmy goby is smaller but critically endangered and nearly impossible to source outside Southeast Asia.

Can nano fish go in a 5-gallon tank?

A 5-gallon is the absolute minimum and only suitable for a single species in very small numbers. I recommend 10 gallons as the working minimum for any nano fish group. A 10-gallon is easier to keep stable, supports a proper group size, and gives you more options. The stability of a 10-gallon versus a 5-gallon is not trivial for small, sensitive fish.

Are nano fish harder to keep than regular fish?

Many of them are, yes. Small bodies mean less tolerance for parameter swings. Species like chili rasboras and green neon tetras need soft, acidic water and mature tanks. Hardy nano fish like endler’s livebearers and ember tetras are exceptions. Research the specific species before buying, not after.

How many nano fish can I put in a 10-gallon tank?

For a species like chili rasboras or ember tetras, 10 to 15 fish in a 10-gallon is reasonable if the tank is well-filtered and you’re doing regular water changes. Don’t overcrowd just because the fish are small. Bioload matters regardless of size. A 10-gallon with 10 chili rasboras is a better tank than a 10-gallon with 25 of any nano species.

Can I mix different nano fish species in the same tank?

Yes, in a large enough tank with compatible species. Chili rasboras and pygmy corydoras work well together in a 15 to 20-gallon planted setup. The key is ensuring each species has a large enough group of its own kind, the water parameters suit both species, and the tank has enough space to prevent competition. Don’t mix species that need very different water chemistry.

Closing Thoughts

Nano fish are one of the most rewarding directions you can take in this hobby. A well-planted 20-gallon with a group of chili rasboras, a school of pygmy corydoras, and a pair of sparkling gouramis is a complete, visually impressive tank that doesn’t require a lot of space or budget. But it does require the right setup and the right water. Skip the shortcuts and these fish will reward you.

The fish listed here vary from genuinely beginner-friendly to specialist-level. Read the care notes for each one before purchasing. Start with ember tetras or endler’s livebearers if you’re new to nano setups. Work toward chili rasboras or green neon tetras once your tank is mature and stable.

For sourcing quality nano fish, Flip Aquatics and Dan’s Fish are reliable options that ship healthy fish with guarantees.

March 12, 2024

Fish for a 55 Gallon Tank: My 21 Picks After Years in the Aquarium Trade

I’ve personally cared for nearly every fish on this list through my years working at local fish stores, so I can tell you firsthand which ones thrive in a 55-gallon setup and which ones cause problems. A 55-gallon tank is a fantastic size. It opens the door to impressive centerpiece fish and schooling communities alike, but that wide range of options is exactly where most fishkeepers go wrong. In this guide, I’ll share my top 21 picks, along with the stocking realities I see most often overlooked.

The 55-gallon is one of the most versatile tank sizes in the hobby. The challenge is not finding fish that fit. It’s choosing the right fish and building a coherent stocking plan instead of adding whatever catches your eye at the store.

Expert Take | Mark Valderrama, AquariumStoreDepot

A 55-gallon is where most hobbyists hit their stride. You have enough volume to keep water parameters stable, enough footprint (48 x 12 inches / 122 x 30 cm) to suit schooling fish and centerpiece species alike, and enough room to make stocking mistakes without immediate crisis. My advice: decide on your fish identity before you buy anything. A community schooling tank, a cichlid pair tank, and an African cichlid setup are completely different ecosystems. Trying to blend them is where most 55-gallon builds fall apart.

Key Takeaways

There are hundreds of species that work in a 55-gallon, but the best stocking plans are built around a single concept: community schooling, centerpiece species, cichlid setup, or predator tank.
The 48-inch footprint suits active schooling fish well. Species that need length to swim (large barbs, rainbowfish, denison barbs) do better in a 55 than a 40-gallon tall.
Inch-per-gallon is a myth. Do not use it. Bioload, waste output, and adult size are what matter. An oscar in a 55-gallon is at capacity. A school of neon tetras in the same tank is barely touching it.
Water parameters should be decided before fish are chosen, not after. Your local water chemistry determines which fish groups make sense for your setup.
The biggest stocking mistake: choosing fish for their appearance without researching adult size, temperament, and water requirements.

How to Stock a 55-Gallon Tank: Three Approaches That Work

ASD Stocking Tiers for a 55-Gallon Tank

Tier 1 (Beginner Friendly): Community schooling setup. Pick one species per level: a school of mid-level tetras or rasboras (10 to 15 fish), a bottom-dwelling group (6 to 8 corydoras), and a single centerpiece (a gourami, a small cichlid pair, or a betta). Easy to maintain, forgiving on water chemistry, looks excellent planted.

Tier 2 (Intermediate): Centerpiece species setup. Build the tank around one or two focal fish: a pair of angelfish, a single discus group, a pair of German blue rams in a planted soft-water tank. The centerpiece species determines your water parameters and tank mates.

Tier 3 (Dedicated): Single-species or species-group setup. African cichlid colonies, convict cichlid breeding pairs, or a single large predator (oscar, jack dempsey) in a species-only or dither-fish setup. High personality, high commitment, high reward.

Best Freshwater Fish For 55 Gallon Tanks

You can check out this video from our official YouTube Channel while following along on this blog post.

1. Freshwater Angelfish

Scientific name: Pterophyllum scalare
Care level: Easy
Minimum tank size: 40 gallons
Temperament: Generally peaceful but may be aggressive when breeding and will eat nano fish
Adult fish size: 6 inches (15 cm)
Origin: South America
Temperature: 75 to 82°F (24 to 28°C)
pH: 6 to 7
Diet: Omnivore
Swim Level: Mid-level
Type: Centerpiece

Freshwater angelfish are some of the most beautiful and elegant fish in the hobby and they thrive in a standard four-foot aquarium. These stunning South American cichlids are available in a range of different breeds, from pure white to black and multicolored.

A pair of angelfish in a 55-gallon planted tank is usually a great idea. Be aware that these fish can show territorial behavior around breeding time and they will snack on nano fish when they can catch them.

Mark’s Pick: Top Centerpiece for a 55-Gallon

If I were setting up a 55-gallon freshwater community tank today, angelfish would be my first choice. A pair in a well-planted setup is genuinely stunning. I’ve seen this work beautifully dozens of times through my years in the aquarium trade. Plan your community around them from the start and avoid adding nano fish as tank mates. Neon tetras and angelfish is a classic mistake. Angelfish are cichlids, and neons are angel food once the fish matures.

2. Congo Tetra

Scientific name: Phenacogrammus interruptus
Care level: Easy
Minimum tank size: 30 gallons
Temperament: Peaceful
Adult fish size: 2.5 to 3 inches (6 to 7.5 cm)
Origin: West Africa
Temperature: 73 to 82°F (23 to 28°C)
pH: 6 to 7.5
Diet: Omnivore
Swim Level: Middle and upper levels
Type: Schooling fish

The Congo tetra is a beautiful African schooling fish ideal for larger aquariums. Males are neon blue with an orange horizontal stripe and interesting pointed tail fins. Females have a classy gold and silvery color with shorter tails and more compact dorsal fins. A school of six or more will add variety and movement to the water column.

3. African Cichlids

Scientific name: Various
Care level: Moderate
Minimum tank size: Various
Temperament: Semi-aggressive
Adult fish size: 1.5 to 5 inches (4 to 13 cm)
Origin: East Africa
Temperature: 77 to 82°F (25 to 28°C)
pH: 7.5 to 9
Diet: Species dependent
Swim Level: Lower and middle levels
Type: Centerpiece fish

A four-foot tank is just large enough for an African cichlid setup, although it’s important to choose the right species to minimize territorial disputes and provide the hard, high-pH water these fish require. Smaller mbuna cichlids like yellow labs or shell dwellers are ideal for this tank size. You could also start a breeding group of a smaller peacock species.

4. Synodontis Catfish

Scientific name: Synodontis spp.
Care level: Easy to moderate
Minimum tank size: 30 to 50 gallons
Temperament: Peaceful / Semi-aggressive
Adult fish size: 4 to 8 inches (10 to 20 cm)
Origin: East Africa
Temperature: 74 to 82°F (23 to 28°C)
pH: 7.5 to 8.5
Diet: Omnivore
Swim Level: Bottom
Type: Bottom dweller

There are several species of Synodontis catfish available in the aquarium hobby, and these interesting fish are especially popular as bottom-dwelling tank mates in an African cichlid setup. They tolerate the hard, alkaline water that African cichlids require, which makes them one of the few reliable bottom-dweller options for that type of tank. Synodontis prefer the company of their own kind, so pick up a school of four or more.

5. Discus

Scientific name: Symphysodon discus
Care level: Advanced
Minimum tank size: 55 gallons (75+ is better)
Temperament: Peaceful
Adult fish size: 5 to 6 inches (13 to 15 cm)
Origin: South America
Temperature: 82 to 89°F (28 to 32°C)
pH: 6 to 6.5
Diet: Omnivore
Swim Level: Middle levels
Type: Centerpiece

It is possible to keep discus cichlids in a tank as small as 55 gallons, but this is a dedicated setup, not a casual one. Discus require soft, acidic water, warm temperatures (82 to 86°F / 28 to 30°C), and exceptional water quality maintained through frequent water changes. If you’ve always wanted to keep the king of the aquarium and have the commitment for it, a 55-gallon is a workable starting point.

6. Corydoras Catfish

Scientific name: Corydoras spp.
Care level: Easy
Minimum tank size: 30 gallons for most species
Temperament: Peaceful
Adult fish size: 2 to 3 inches (5 to 7.5 cm)
Origin: South America
Temperature: 74 to 80°F (23 to 27°C)
pH: 5.5 to 8
Diet: Omnivore
Swim Level: Bottom
Type: Bottom dweller

Corydoras catfish can be kept in tanks as small as 30 gallons, but a 55-gallon tank allows you to keep a larger school or even a few different species. These peaceful fish hang out on the bottom and search the substrate for leftover food scraps. There are many species available, including panda cories, Sterbai cories, and albino breeds. Keep a school of at least 5 of the same species and provide a sinking bottom feeder tablet.

7. Ram Cichlids

Scientific name: Mikrogeophagus ramirezi
Care level: Moderate to advanced
Minimum tank size: 20 gallons
Temperament: Peaceful
Adult fish size: 2.5 inches (6 cm)
Origin: South America
Temperature: 78 to 86°F (26 to 30°C)
pH: 5.5 to 7.5
Diet: Omnivore
Swim Level: Lower levels
Type: Centerpiece

The ram is a colorful dwarf cichlid from South America. These gorgeous fish are relatively shy and sensitive for a cichlid, but they make a great centerpiece in a soft-water 55-gallon planted tank. Ram cichlids prefer a sand substrate they can sift through in search of food. Set your heater in the low 80s°F (around 27 to 28°C) to recreate their natural habitat.

8. Neon Tetras

Scientific name: Paracheirodon innesi
Care level: Moderate
Minimum tank size: 10 gallons
Temperament: Peaceful
Adult fish size: 1.5 inches (4 cm)
Origin: South America
Temperature: 70 to 79°F (21 to 26°C)
pH: 6 to 7
Diet: Omnivore
Swim Level: Middle levels
Type: Schooling fish

Who says you can’t keep small fish in a big tank? The neon tetra is a classic community fish that thrives in a large aquarium filled with live plants and other small peaceful species. These fish look their best in a large school, and a 55-gallon is ideal. Aim for 20 or more neons for full effect in this size tank.

9. Small to Mid-Sized Plecos

Scientific name: Ancistrus spp., Hypancistrus spp., Panaques spp.
Care level: Easy to advanced (species dependent)
Minimum tank size: 20 gallons
Temperament: Peaceful
Adult fish size: 3 to 6 inches (7.5 to 15 cm)
Origin: South America
Temperature: Species dependent
pH: Slightly acidic to slightly basic
Diet: Herbivore
Swim Level: Bottom
Type: Bottom dweller

There are well over a hundred pleco species, some growing to more than a foot in length. In a 55-gallon, stick to species that max out under 6 inches (15 cm): bristlenose plecos, clown plecos, or rubber lip plecos. These peaceful bottom dwellers are safe with smaller fish and will help manage algae. Include plenty of rocks and driftwood for hiding spaces and food sources.

10. Geophagus

Scientific name: Geophagus spp., Satanoperca spp.
Care level: Moderate
Minimum tank size: 55 gallons for smaller species
Temperament: Generally peaceful
Adult fish size: 6+ inches (15+ cm)
Origin: South America
Temperature: Species dependent
pH: Species dependent
Diet: Omnivore
Swim Level: Lower levels
Type: Centerpiece

Geophagus are colorful South American cichlids that sift through the substrate in search of food. Keep them on a fine sandy substrate and choose smaller species that stay around 6 inches (15 cm) or under, such as Geophagus tapajos. These fish are not suited to a carefully aquascaped tank as they constantly rearrange the bottom.

11. Rainbowfish

Scientific name: Melanotaenia spp.
Care level: Easy to moderate
Minimum tank size: 30 gallons
Temperament: Peaceful
Adult fish size: 2 to 6 inches (5 to 15 cm)
Origin: Australia and Indonesia
Temperature: 74 to 80°F (23 to 27°C)
pH: 6.5 to 8
Diet: Omnivore
Swim Level: Middle levels
Type: Schooling fish

Rainbowfish are peaceful, active schooling fish that add color and movement to a 55-gallon aquarium. The 48-inch length of a standard 55-gallon suits their active swimming style particularly well. Popular species include the Boesmani rainbow and the smaller dwarf neon rainbow. Check out my guide to 15 popular rainbowfish types for species details.

12. Convict Cichlids

Scientific name: Amatitlania nigrofasciata
Care level: Easy
Minimum tank size: 30 gallons
Temperament: Aggressive
Adult fish size: 3.5 to 6 inches (9 to 15 cm)
Origin: Central America
Temperature: 74 to 84°F (23 to 29°C)
pH: 6.5 to 8
Diet: Omnivore
Swim Level: Lower levels
Type: Centerpiece

The convict cichlid is one of the easiest cichlids to keep and one of the most prolific breeders in the hobby. A breeding pair in a 55-gallon is entertaining and low maintenance, but be aware that these fish spawn so reliably that fry management becomes a real consideration. If you’re not prepared to deal with regular breeding, choose a different species.

13. Tiger Barbs

Scientific name: Puntigrus tetrazona
Care level: Easy
Minimum tank size: 30 gallons
Temperament: Semi-aggressive
Adult fish size: 3 inches (7.5 cm)
Origin: Southeast Asia
Temperature: 73 to 86°F (23 to 30°C)
pH: 6 to 8
Diet: Omnivore
Swim Level: Middle levels
Type: Schooling fish

Named for its orange body and four vertical black stripes, the tiger barb is an attractive schooling fish from Southeast Asia. These active barbs have a reputation for nipping, but they behave much better in large schools of 15 or more. Tiger barbs can coexist with fast-moving bottom-dwellers and other schooling fish. Avoid slow-moving tank mates or fish with long, flowing fins.

14. Rainbow Cichlid

Scientific name: Herotilapia multispinosa
Care level: Easy
Minimum tank size: 20 gallons
Temperament: Relatively peaceful
Adult fish size: 4 to 5 inches (10 to 13 cm)
Origin: Central America
Temperature: 72 to 82°F (22 to 28°C)
pH: 7 to 8
Diet: Omnivore
Swim Level: Lower levels
Type: Centerpiece

The rainbow cichlid is a beautiful Central American fish that is relatively peaceful for a cichlid. It has a golden color with a prominent black streak along each side that may break into blotches. A pair of rainbow cichlids is an excellent choice for a planted 55-gallon tank with suitable tank mates.

15. Denison Barb

Scientific name: Sahyadria denisonii
Care level: Easy
Minimum tank size: 55 gallons
Temperament: Peaceful
Adult fish size: 4 inches (10 cm)
Origin: India
Temperature: 59 to 77°F (15 to 25°C)
pH: 6.5 to 7.8
Diet: Omnivore
Swim Level: Middle levels
Type: Schooling fish

Also known as the roseline shark, denison barbs are one of the best-looking barbs in the hobby. These speedy schooling fish combine sleek lines and silvery scales with a bright red streak and yellow tail spots. A 55-gallon provides just enough swimming space for a small school (6+) of these peaceful fish. Denison barbs enjoy cooler water temperatures, so factor that in when selecting tank mates.

16. Electric Blue Acara

Scientific name: Andinoacara pulcher
Care level: Moderate
Minimum tank size: 40 gallons
Temperament: Semi-aggressive
Adult fish size: 6 to 7 inches (15 to 18 cm)
Origin: Trinidad and Venezuela
Temperature: 74 to 82°F (23 to 28°C)
pH: 6 to 7
Diet: Omnivore
Swim Level: Lower half
Type: Centerpiece

The electric blue acara is one of the most striking centerpiece fish available for a 55-gallon setup. The metallic blue coloration is exceptional under proper lighting. This cichlid is moderately sized, generally peaceful outside of breeding, and tolerates a reasonably wide range of water conditions. It pairs well with mid-level schooling fish that are too large to be seen as prey.

17. Jack Dempsey

The Jack Dempsey (Rocio octofasciata) is a bold, colorful cichlid that fits in a 55-gallon but will dominate it. Adults reach 7 to 8 inches (18 to 20 cm) and establish strong territorial claims. A single Jack Dempsey or a bonded pair is workable in a 55-gallon. Adding multiple males or mixing with other cichlids of similar aggression requires careful layout and monitoring. This is a personality fish. It will know you, recognize you at the glass, and reward the investment.

18. Oscar

Oscars (Astronotus ocellatus) grow to 12 to 14 inches (30 to 36 cm) and produce enormous waste loads. A 55-gallon is a starter tank for a juvenile oscar, not a permanent home. If you commit to an oscar, plan for a 75-gallon (284 L) minimum as an adult tank. The payoff is one of the most interactive, personality-driven fish in freshwater. They recognize their owners, beg for food, and rearrange their tank continuously. Just understand the commitment upfront.

19. Flowerhorn

Flowerhorns are hybrid cichlids with enormous humps (nuchal humps) on their heads and bold color patterns. They reach 12 inches (30 cm) and are exclusively a species-only fish. No tank mates. Like oscars, a 55-gallon works for juveniles but they need larger quarters as adults. They are one of the most visually dramatic fish you can keep in freshwater.

20. Betta Sorority

A betta sorority tank with multiple female bettas is an interesting option for a 55-gallon. It is not a beginner setup. Keep only females, a minimum group of five to spread out aggression, and have a backup plan if a fish becomes too aggressive. In the right hands this can be a stunning planted tank. In the wrong hands it creates a lot of injured fish.

21. Mollies

Scientific name: Poecilia spp.
Care level: Moderate
Minimum tank size: 20 gallons
Temperament: Generally peaceful
Adult fish size: 3 to 6 inches (7.5 to 15 cm) depending on species
Origin: North, Central, and South America
Temperature: 72 to 82°F (22 to 28°C)
pH: 7 to 8.5
Diet: Omnivore
Swim Level: Middle levels
Type: Schooling fish

Mollies are medium-sized livebearers ideal for a 55-gallon aquarium. Highly adaptable and available in many color varieties, they work well in a community tank or a dedicated livebearer tank with guppies and similar species. They prefer slightly hard water, which makes them a natural fit for livbearer-focused setups.

Avoid These 55-Gallon Stocking Mistakes

Using the inch-per-gallon rule. It is not a reliable stocking guide. It does not account for bioload, waste output, or swimming behavior. Use it as a rough starting point only, then research each species individually.
Putting an oscar or jack dempsey in with community fish. These are predators. They will eat or bully anything smaller. Species-only or carefully selected large tank mates only.
Mixing African cichlids with community fish. The pH and hardness requirements are incompatible. One group will always be in the wrong water.
Adding discus without understanding their temperature needs. 82 to 86°F (28 to 30°C) eliminates most community fish as tank mate options. This is a specialist setup from day one.
Choosing fish by appearance without checking adult size. The $3 fish that looks good in a 4-inch bag at the store may be 12 inches and producing more waste than your filter can handle in a year.

Choosing Your Stocking Approach: Community vs. Cichlid vs. Predator

Setup Type	Difficulty	Fish Count	Visual Impact	Maintenance	Best For
Community schooling	Beginner	25 to 50+	High (planted)	Weekly WC	First 55-gallon setup
Centerpiece species	Intermediate	2 to 15	Very High	Moderate to high	Showpiece builds
African cichlid colony	Intermediate	15 to 25	High (color)	Moderate	Active, colorful tanks
Single large predator	Intermediate	1 to 3	Moderate	High (bioload)	Personality fish keepers

Other Options

All the fish mentioned in this guide are excellent options for a 55-gallon setup, and there are hundreds more species that thrive in this versatile tank size. Looking for more inspiration? Check out these guides:

FAQ

What fish can you put in a 55-gallon fish tank?

55-gallon tanks are large enough for most popular freshwater aquarium fish sold in fish stores. The key is matching the fish to your water parameters and building a coherent stocking plan before you buy. Start with your water chemistry, decide on a tank concept (community, cichlid, predator), then select species that fit both.

What is the largest fish for a 55-gallon tank?

New World cichlids like oscars and jack dempseys are about the largest fish you can keep in a 55-gallon, though they prefer a larger tank when fully grown. A juvenile oscar works in a 55-gallon for the first year or so. An adult oscar at 12 to 14 inches (30 to 36 cm) needs a 75-gallon (284 L) minimum.

How do you stock a 55-gallon tank?

Start with your water parameters. Hard water suits livebearers and African cichlids. Soft water suits South American and West African species. Decide on your tank concept first, then choose species that fit it. Populate all three levels of the water column (bottom, mid-level, surface) for a balanced community setup.

How many fish can you have in a 55-gallon tank?

This depends entirely on species and bioload. A single adult oscar nearly maxes out a 55-gallon on its own. A school of chili rasboras at 0.7 inches (1.8 cm) each could number 40 or more in the same tank. Fish count is meaningless without species context. Focus on bioload and adult size, not number of fish.

What can I put in a 55-gallon tank besides fish?

Freshwater invertebrates like shrimp and snails, amphibians like axolotls and African dwarf frogs, and small freshwater turtles all work in a 55-gallon given the right setup and parameters.

Final Thoughts

A 55-gallon tank is genuinely one of the best investments in the freshwater hobby. It gives you enough volume to maintain stable water chemistry, enough footprint to suit schooling fish properly, and enough flexibility to try almost any freshwater concept you are interested in. The fish that does best in a 55-gallon is the fish you plan around from the beginning. Decide your concept, match your water parameters, and build the tank before you buy the fish. Every successful 55-gallon I’ve seen has followed that sequence. Every problem tank I’ve had to help troubleshoot over the years skipped it.

Where to Buy Quality Fish for a 55-Gallon Setup

These are the online suppliers I recommend for healthy, properly conditioned livestock:

Flip Aquatics – Quarantine-certified livestock, live arrival guarantee, and a wide selection of the species on this list. Use code ASDFLIPPROMO for a discount.
Dan’s Fish – Reliable source for community fish, cichlids, and specialty species. Good for stocking multiple species at once.

References

Seriously Fish – Species profiles and care data
FishBase – Taxonomy and scientific data
Practical Fishkeeping – Husbandry and care advice

March 2, 2024

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

I’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. They’re peaceful, do an excellent job on hard surfaces and glass, and won’t provoke even the most territorial betta. In a big enough tank, I’d pair them with an Otocinclus or two for extra coverage.

The thing most people miss: the moment you add any algae eater to a betta tank, you’re running a community setup. And community setup rules apply. Tank size matters more than people realize. A 5-gallon betta tank with a mystery snail is one thing. A 5-gallon with an Amano shrimp is a gamble. A 5-gallon with a Siamese algae eater is a disaster waiting to happen.

The list of algae eaters that actually work with bettas is short. That’s the honest answer. Most of the popular algae eaters are either too large, too active, too territorial about the same tank zones, or outright dangerous to pair with a betta. Here are the 7 that can actually work, with the full context on why each one does or doesn’t fit your setup.

EXPERT TAKE | MARK VALDERRAMA

After keeping bettas for years, my framework for evaluating any algae eater for a betta tank comes down to three questions: Does it share the same water column zone as the betta? Does it have features (long fins, bright colors, suckermouth behavior near the betta’s territory) that will trigger aggression? And is it big enough to be threatened by the betta but small enough to be harassed into stress? Nerite snails pass all three with zero concerns. Otocinclus pass if the tank is at least 20 gallons and well-established. Siamese algae eaters fail all three. That’s the framework. Apply it before you buy anything.

Key Takeaways

The safest algae eaters for bettas are nerite snails, mystery snails, and Otocinclus catfish
Most popular algae eaters are poor choices: Siamese algae eaters are too active and large, plecos are too territorial, and Chinese algae eaters become aggressive as adults
Algae eaters in a betta tank require at least a 20-gallon setup; anything smaller and you’re creating problems, not solving them
Supplement your algae eaters with targeted food; they will not survive on tank algae alone
Live plants are the most sustainable long-term algae management tool; algae eaters are a complement, not a standalone solution

What Is Algae and Why Does It Grow?

Algae are photosynthetic organisms that thrive when light and nutrients align in the right conditions. In a betta tank, that usually means: too much light duration, excess nutrients from overfeeding, or not enough plant competition to absorb available nutrients.

Algae blooms are normal in new tanks cycling for the first time. Some algae in a mature aquarium is also completely normal and not a problem that needs solving. The goal isn’t zero algae. The goal is control.

There are many types of aquarium algae, and they don’t all respond the same way to algae eaters. Green spot algae (the hard stuff on glass) is great territory for nerite snails. Soft green hair algae is Otocinclus food. Black beard algae is barely touched by any fish. A UV sterilizer handles green water (suspended algae). No single algae eater handles everything, and some algae types require non-biological solutions entirely.

The Betta Compatibility Challenge

Bettas were selectively bred for fighting. That history still shows up in a lot of individuals, particularly males. Betta aggression toward tankmates is individual and situational. Some bettas are remarkably calm. Others will attack anything that enters their line of sight.

The compatibility challenge with algae eaters specifically:

Many algae eaters are bottom or glass dwellers. Bettas hang in the middle to upper column. Zone separation helps.
Long-finned, flowing, or brightly colored algae eaters trigger fin nipping from the betta or aggression in the other direction. Avoid anything that looks like it could be mistaken for a betta rival.
Suckermouth catfish that attach to surfaces near the betta’s resting spots create territory conflicts that escalate fast.
Small, stressed algae eaters become targets for harassment. If the algae eater is small enough to look like prey, assume it’s at risk.

The biggest mistake I see: people add algae eaters to a 5 or 10-gallon betta tank without accepting that they’re now running a community setup. The moment you add another inhabitant, everything about tank size, filtration, territory, and stress tolerance becomes critical. My recommendation: if you want algae eaters with your betta, aim for at least a 20-gallon (76 L) tank. And always have a backup plan.

TIER BREAKDOWN

Safest (minimal betta conflict risk): Nerite Snails, Mystery Snails
Good with the right setup (20+ gallon, established tank): Otocinclus, Amano Shrimp, Ghost Shrimp
Situational (individual betta dependent): Corydoras, Malaysian Trumpet Snails
Avoid entirely with bettas: Siamese Algae Eater, Chinese Algae Eater, Bristlenose Pleco, Common Pleco, any large suckermouth catfish

Algae Eater for Betta Tank: 7 Top Picks

These are the options that can realistically work. The list is deliberately short because most algae eaters don’t belong in a betta setup.

1. Otocinclus Catfish

Scientific Name: Otocinclus sp.
Care Level: Moderate
Adult Size: 1.5–2 inches (4–5 cm)
Min Tank Size: 20 gallons (76 L) with betta
Temperature: 72–82°F (22–28°C)
pH: 6.0–7.5
Algae Specialty: Soft green algae, diatoms, biofilm on glass and plant leaves

Otocinclus are small, peaceful, and occupy the lower water column without encroaching on betta territory. They’re excellent soft algae cleaners and leave the betta completely alone. The challenges: they need an established tank with existing algae growth to feed on, and they need supplemental food (blanched zucchini or algae wafers) because they will starve in a clean tank. They also do best in groups of 4 or more, which requires the tank space to support them.

In a 20-gallon or larger with a non-aggressive betta, a small group of Otocinclus is one of the better combinations available.

2. Nerite Snails

Scientific Name: Neritina sp.
Care Level: Easy
Adult Size: 0.5–1 inch (1.3–2.5 cm)
Min Tank Size: 5 gallons (19 L)
Temperature: 72–78°F (22–26°C)
pH: 7.0–8.0
Algae Specialty: Green spot algae, diatoms, hard surface algae on glass and decor

The safest algae eater for a betta tank, period. Nerites stay on glass and hard surfaces, have no features that trigger betta aggression, and are practically indestructible from a care standpoint. They won’t reproduce in freshwater (eggs require brackish conditions to hatch), so no snail population explosion. The only downsides: they lay white eggs on surfaces that are cosmetically annoying to some keepers, and they don’t eat every algae type.

If someone asks me for one algae eater recommendation for a betta tank, this is it every time.

3. Mystery Snails

Scientific Name: Pomacea bridgesii
Care Level: Easy
Adult Size: 1.5–2 inches (4–5 cm)
Min Tank Size: 5 gallons (19 L)
Temperature: 68–82°F (20–28°C)
pH: 7.0–8.0
Algae Specialty: Soft algae, biofilm, decaying plant matter

Mystery snails are larger than nerites and more visible, which means some bettas will investigate them aggressively. Most bettas lose interest once they realize the snail is hard-shelled and not worth the effort. Watch for the first few days after introduction: if your betta is actively harassing the snail and preventing it from feeding, remove it. Otherwise, mystery snails are peaceful, attractive, and useful tank cleaners beyond just algae.

4. Amano Shrimp

Scientific Name: Caridina multidentata
Care Level: Easy–Moderate
Adult Size: 1.5–2 inches (4–5 cm)
Min Tank Size: 20 gallons (76 L) with betta
Temperature: 70–80°F (21–27°C)
pH: 6.5–7.5
Algae Specialty: Hair algae, soft algae, organic debris

Amano shrimp are the best shrimp option for betta tanks because their size makes them less vulnerable than smaller cherry shrimp. They’re vigorous algae eaters, particularly for hair algae, and they work quickly. The risk: individual bettas vary in how they react to shrimp. Some ignore them completely. Others hunt them relentlessly. Plants and hiding spots reduce the risk significantly. In a well-planted 20-gallon with a calm betta, Amano shrimp work well.

5. Ghost Shrimp

Scientific Name: Palaemonetes sp.
Care Level: Easy
Adult Size: 1–1.5 inches (2.5–4 cm)
Min Tank Size: 10 gallons (38 L) with betta
Temperature: 65–82°F (18–28°C)
pH: 7.0–8.0
Algae Specialty: Soft algae, biofilm, food particles

Ghost shrimp are transparent and small, which makes them less triggering to bettas visually but also more vulnerable if the betta decides to hunt. Their near-invisibility is a partial protection. They’re not the most effective algae eaters on this list, but they’re inexpensive enough that if your betta eats a few, it’s not a major loss. Good for tanks where you want some biological cleanup activity without significant risk.

6. Malaysian Trumpet Snails

Scientific Name: Melanoides tuberculata
Care Level: Easy
Adult Size: 0.5–1 inch (1.3–2.5 cm)
Min Tank Size: 5 gallons (19 L)
Temperature: 70–80°F (21–27°C)
pH: 6.5–8.0
Algae Specialty: Substrate biofilm, detritus, soft surface algae

Malaysian trumpet snails live primarily in the substrate, which means bettas barely notice them. They burrow, aerate the substrate, and consume detritus and substrate biofilm. The downside: they breed prolifically in response to available food. Population control requires reducing feeding and manual removal. They’re not primarily an algae eater, but their substrate cleaning function is genuinely useful and the betta compatibility is excellent.

7. Corydoras Catfish

Scientific Name: Corydoras sp.
Care Level: Easy
Adult Size: 1–2.5 inches (2.5–6.4 cm) depending on species
Min Tank Size: 20 gallons (76 L) with betta
Temperature: 72–82°F (22–28°C)
pH: 6.0–7.5
Algae Specialty: Soft substrate algae and biofilm; more of a scavenger than a dedicated algae eater

Corydoras are peaceful bottom dwellers that stay out of the betta’s mid-water territory. They’re not primarily algae eaters: they’re omnivorous scavengers that eat leftover food, detritus, and soft substrate algae as part of their diet. They won’t solve an algae problem, but they contribute to overall tank cleanliness and get along with most bettas. They need groups of 4 or more, which means they’re only appropriate in 20+ gallon betta setups.

Species	Difficulty	Max Size	Min Tank	Notes
Otocinclus	Moderate	2 in (5 cm)	20 gal	Best algae cleaner; needs established tank and supplement feeding
Nerite Snail	Easy	1 in (2.5 cm)	5 gal	Safest overall pick; no reproduction in freshwater
Mystery Snail	Easy	2 in (5 cm)	5 gal	Watch for betta harassment; usually fine after initial curiosity
Amano Shrimp	Easy–Moderate	2 in (5 cm)	20 gal	Best shrimp option; betta temperament dependent
Ghost Shrimp	Easy	1.5 in (4 cm)	10 gal	Near-invisible; lower risk but also less effective
Malaysian Trumpet Snail	Easy	1 in (2.5 cm)	5 gal	Substrate cleaner; control population by managing food
Corydoras	Easy	2.5 in (6.4 cm)	20 gal	Scavenger more than algae eater; peaceful, needs group of 4+

MARK’S PICK

Nerite snails are my top recommendation for any betta tank. They work on the algae that matters most (green spot on glass, diatom film), they’re impossible for a betta to bother effectively, and they don’t reproduce in freshwater. If your tank is at least 20 gallons and has been running for a few months, add 4–6 Otocinclus alongside 2–3 nerites and you’ll have the best coverage possible without any meaningful betta conflict risk. That combination handles the two most common betta tank algae types without drama.

Algae Eaters That Don’t Belong in a Betta Tank

This is important. The hobby markets a lot of algae eaters that sound plausible for betta tanks but create serious problems in practice.

Siamese Algae Eater

Too large (up to 6 inches / 15 cm), too active, and they share the mid-water column with bettas. Their movement triggers territorial responses, and they get harassed or become harassers. Not a betta tank fish.

Chinese Algae Eater

Juvenile Chinese algae eaters are peaceful algae eaters. Adults become territorial, aggressive, and will latch onto the sides of flat-bodied fish. They’ve been documented attacking and damaging angelfish and goldfish the same way. A betta is not a safe companion for an adult Chinese algae eater.

Common Pleco

Grows to 24 inches (61 cm). The minimum tank size for an adult common pleco alone is 100 gallons (379 L). Anyone selling these as betta tank algae eaters is doing the buyer a serious disservice.

Bristlenose Pleco

A more reasonable size (up to 5 inches / 13 cm), but they’re territorial about surface areas and hiding spots. In a small betta tank they create territory conflicts with the betta’s preferred resting spots. In a 30-gallon or larger with plenty of caves and driftwood they can work, but they’re not the low-conflict option most people assume.

AVOID IF

Don’t add any algae eater to a betta tank if: your tank is under 10 gallons (and under 20 gallons for anything other than snails); your betta has previously attacked snails or tankmates; you can’t provide hiding spots and visual breaks; or you’re not prepared to remove the algae eater if aggression happens. Also avoid algae eaters entirely if your tank is under 3 months old: Otocinclus in particular need established biofilm to survive. A newly cycled tank will starve them regardless of betta compatibility.

Live Plants: The Best Long-Term Algae Control

Live plants outcompete algae for the same nutrients. A well-planted betta tank with appropriate lighting rarely develops serious algae problems because the plants consume what algae would otherwise use to grow.

Easy betta-compatible plants: java fern, anubias, hornwort, water sprite, and floating plants like frogbit or dwarf water lettuce. Floating plants are particularly effective because they reduce light penetration, which cuts off one of the two things algae need most.

Algae eaters are a complement to live plants, not a replacement for them. The combination of plants, nerites, and Otocinclus in a well-maintained 20-gallon is practically algae-proof. A 10-gallon betta tank with no plants relying solely on algae eaters is fighting an uphill battle.

Where to Buy

Nerite snails and mystery snails are available at most fish stores. Otocinclus are common but their health at point of sale varies significantly: look for active fish that are clearly grazing, not fish huddled at the surface or bottom. Emaciated Otocinclus rarely recover.

For quality guaranteed livestock, Flip Aquatics carries a reliable selection of algae eaters, snails, and shrimp. Dan’s Fish is another solid online source for Otocinclus and quality snail stock.

FAQs

Will a betta fish eat my algae eater?

It depends on the species and the individual betta. Snails are safe from being eaten because of their shells. Shrimp are at real risk, especially smaller species like cherry shrimp. Otocinclus are rarely eaten but can be harassed. The safest algae eaters from a predation standpoint are snails: nerites and mystery snails specifically.

Can I put a pleco in my betta tank?

Common plecos are absolutely not appropriate for betta tanks. Bristlenose plecos can work in tanks of 30 gallons or larger with enough territory and decor. But they’re not the passive, conflict-free option they’re often marketed as. If you’re looking for low-drama algae control, start with nerite snails.

How many nerite snails should I get for a betta tank?

One nerite snail per 5 gallons (19 L) is a reasonable starting guideline. In a 10-gallon betta tank, 2 nerites handle the glass and surfaces effectively. In a 20-gallon, 3–4 nerites alongside an Otocinclus group gives comprehensive coverage.

Do algae eaters help with all types of algae?

No. Green spot algae on glass and diatom film: nerites and Otocinclus handle these well. Hair algae: Amano shrimp are the better choice. Black beard algae: almost nothing eats it reliably. Green water (suspended algae): no fish handles this; use a UV sterilizer. Match the algae eater to the algae type you’re dealing with.

What if my betta attacks the algae eater I added?

Remove the algae eater immediately if persistent harassment is occurring. A stressed Otocinclus or shrimp will die within days. Some bettas simply will not tolerate any tankmates regardless of species. That’s the betta’s personality, not a failure of the setup, and there’s no forcing a solution. Snails are the only exception where the betta’s aggression generally can’t cause actual harm.

Closing Thoughts

The list of algae eaters that genuinely work with bettas is short because betta compatibility is a real constraint, not a minor consideration. Nerite snails are the right starting point for almost everyone. If your tank is big enough and your betta’s temperament allows it, Otocinclus are the upgrade.

Don’t overthink the algae problem. In most betta tanks, two or three nerite snails, consistent feeding discipline (overfeeding drives most algae blooms), and a couple of easy live plants solve the issue completely. The fancy algae eaters are for bigger setups where betta aggression has less impact.

For quality snails, Otocinclus, and shrimp for your betta tank, check out Flip Aquatics and Dan’s Fish.

February 26, 2024

Vegetables for Fish: What I Feed My Tanks After 25 Years (And What to Avoid)
I’ve been feeding vegetables to my fish for years. Nori sheets for saltwater tanks, and cucumbers and romaine lettuce for freshwater setups. It’s one of the most underrated things you can do for herbivorous and omnivorous fish, and once they find it, they go for it every time. One critical step most people skip: blanching. Leave it out and you risk fouling your water with pesticide residue and disintegrating plant matter. This guide covers what actually works, what doesn’t, and how to prepare it correctly.
Key Takeaways
- Aquarium fish can be given an assortment of raw and frozen vegetables!
- Veggies are a great way to keep fish healthy by introducing vitamins and minerals that aren’t offered in typical fish food.
- Vegetables can be easily blanched and frozen for easy storage and long-term use.
- Some fish don’t like vegetables or have never been offered them, so algae wafers are a good alternative instead!
Vegetables For Fish – Which Are The Best Ones?

The best vegetable to feed fish (video from our official YouTube Video) is one that will withstand being submerged, at least for an hour or two. This vegetable should not start to disintegrate once a hungry fish starts to get to it. Luckily, a variety of vegetable options can be blanched and eaten by fish.

A good list of rotating veggies might look like:
- Broccoli
- Cucumber
- Zucchini
- Yellow squash
- Spinach
- Romaine lettuce
- Carrot
- Peas
- Nori (great for saltwater fish)
Not all fish will like all vegetables, so it might take some time to figure out which ones to include in your feeding rotation. Most hobbyists like to weigh small pieces down with a rubber band around a rock or a suction clip that attaches to the side of the glass.

🏆 My personal picks: For freshwater tanks, cucumbers are my go-to. fish love them, they hold up well submerged, and they’re easy to prep. For saltwater, Nori (dried seaweed sheets) is the clear winner. tangs and rabbitfish will go absolutely crazy for it on a clip. I’ve also had great results with romaine lettuce in freshwater setups.

Does Your Aquatic Pal Need Them?

Before we even start to discuss how to prepare fresh vegetables for your fish, you need to know if these foods would be similar to something that they would naturally come across in the wild. A carnivorous fish will probably not eat a cucumber, no matter how appealing it might look!

Most likely, you won’t be able to tell whether a fish is a carnivore, herbivore, or omnivore just by looking at it. There might be some signs, like sharp teeth or a sucker mouth, but even then, you can’t be fully sure. The best way to find out the natural diet of your fish species is by doing research about their natural habitat and hearing experiences from other hobbyists or your local aquarium store.

Once you’ve established the natural diet of your fish, you can begin catering to it. If it turns out that you have a herbivore fish, then you might start to supplement blanched vegetables into their diet.

Benefits of Veggies

There are many benefits to giving vegetables to fish. The main benefit is keeping fish healthy by supplementing vitamins and minerals that aren’t supplied through typical fish food¹.

The other main benefit is enrichment. By now, you’ve probably noticed that your fish waits to be fed at the top of the aquarium anytime you walk by. Feeding time is what they look forward to! Adding veggies is a great way to make feeding time even more exciting and unpredictable while also adding variety and balance to your fish’s diet.

What Are Blanched Vegetables?

Simply put, blanching means submerging vegetables or fruits into boiling water for a short period, quickly removing them, and then placing them into a bowl of water with ice. This process only takes a couple of minutes but helps preserve the quality of the vegetable or fruit.

There are a few ways blanching achieves preservation. First, it inactivates enzymes that would otherwise begin to affect color, taste, and nutritional value over time. Similarly, blanching affects bacteria which would also cause the product to degrade faster.

Blanching is especially recommended when using vegetables as fish food due to insecticides and other residues. Unfortunately, many unknowns are used to treat food for consumption, so boiling them first reduces the chances of those chemicals entering the aquarium.

⚠️ The biggest mistake I see: People skip blanching entirely. Raw, unblanched vegetables can foul your water fast as they break down, and you’re putting pesticide residue directly into your tank. Blanching takes about two minutes and makes a real difference. don’t skip it.

All in all, blanching fresh fruits and vegetables helps preserve them for longer and allows for easy freezing and storage. In the aquarium setting, most hobbyists only offer vegetables as fruits can be messy.

Can You Serve Them Raw?

Yes! Tropical fish can be fed raw vegetables. Blanching is recommended for hobbyists who want to keep vegetables on hand for future use. There are a couple of things that need to be considered, though.

As mentioned before, veggies are often treated with chemicals and other preservatives. These should be thoroughly washed off before being added to the tank. It is also likely that these pieces of raw vegetables will end up floating on the surface of the water, so it might take some extra effort to weigh them down.

How To Blanch Them

Almost any vegetable can be blanched, but not every blanched vegetable is good for the aquarium. Instead, certain hard vegetables, like broccoli, cucumber, zucchini, and peas, are some of the favorite feeding options for herbivores. This is because other vegetable matter can easily break down and start to affect water quality.

Vegetables with strong aromas, like brussels sprouts and onions, should be avoided as they can start to affect water conditions as well.

Buying Them

This might seem obvious, but you need to purchase your vegetables at the grocery store. Your local fish store will not have fresh vegetables! Now the question comes down to picking the right veggies for your fish.

Should you buy organic?

You definitely want to pick the best vegetables possible to feed your fish, and you should be mindful of what you’re putting in the aquarium. However, there is likely little difference between buying organic and using regular produce. The blanching process should hopefully remove any chemicals or additives in either option.

If you want to feed raw cucumber or another vegetable fresh from the rack, then it may be the better choice to buy organic.

Preparation

Depending on what type of vegetables you get for your fish, you might need to do some prep work. Think about how much food you want to give to your fish, for how long, and if you could use the leftovers for your own consumption!

Some vegetables, like zucchini, cucumber, and broccoli, will need to be cut up into manageable pieces. The goal should be to slice to expose as much of the soft, inside flesh as possible as fish will likely eat these sections first. For something like zucchini, slice each piece to be about 0.5 inches. Most other vegetables, like spinach and lettuce, can be split apart and fed more easily.

Now, you will want to consider how long you want to serve your fish this food. Fish eat as much as is available, so it’s not recommended to give it all at once. But you don’t want to be feeding the same thing for a month either! Prepare enough food for several feedings. Save some for blanching and save some for the dinner table.

Blanching Steps

Now it’s finally time to blanch the veggies. This process is straightforward and easy and almost impossible to mess up.
1. Bring a pot of water to a rolling boil. The boiling water will activate those processes we talked about earlier!
2. Fill a separate bowl with water and ice.
3. Add the sliced vegetables to the boiling water.
4. Allow them to boil for 1-3 minutes depending on the size of the slices.
5. Remove the vegetables when they’re crispy. A crunchy vegetable needs more time and a mushy vegetable has gone too long.
6. Add the veggies to the ice bath. Let them sit in the cold water for a minute or two.
7. If you’re planning on freezing the vegetables, then wait until they’re completely cooled and dried. Then, store them in a plastic bag in the freezer.
Feeding Your Fish

When you’re ready to feed your fish, make sure to fully thaw the frozen vegetable matter. You may need to weigh it down with a rock or clip so that it doesn’t float.

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Allow your fish to eat. It might take some time for them to find and understand that the vegetable matter is food. Snails are also naturally slow!

After a couple of hours, remove what remains of the veggies. If your fish and snails liked what they were given, you might just find vegetable skin left over.

How Often To Feed Vegetables?

How often you feed your fish fresh or frozen vegetables will depend on how many fish are present and their feeding habits.

If you have a larger tank with lots of tropical fish, shrimp, and snails, then you will need more food to make sure that everyone is getting fed. Always make sure to keep an eye on uneaten food and remove any pieces that could potentially get stuck in the back of the tank.

In general, fresh and frozen vegetables can be given one to two times a week to create a well-balanced diet.

Alternatives

While most aquarium fish enjoy a veggie snack every now and then, some fish simply don’t like vegetables, even if they’re herbivores.

It makes sense why a carnivorous fish might not eat veggies, but why wouldn’t a herbivore?

It is possible that your fish was never introduced to any foods other than flake or pellet foods. They might not know how to eat veggies! In cases like this, you can continue to offer your fish fresh vegetables until they take a nibble, or you could settle with a high-quality algae wafer or pellet.

For saltwater fish, consider a product like Julian Sprung’s Sea-Veggies

Great For Algae Eaters

Sea Veggies Seaweed Green

Sea veggies is an amazing product for Tangs, Rabbitfish, and Marine Angelfish. Fish go crazy for it. Clean and easy to feed!

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FAQs

What vegetables can I feed my fish?

Tropical fish love most vegetables! But every fish will have its own appetite. The best veggies to feed fish include lettuce, peas, zucchini, and cucumber. These can be given raw or frozen as long as they are prepared and thawed before serving.

Can I feed my fish fruits?

While fruits can be blanched and stored for serving later, it’s not recommended to give fruits to fish. This is because fruit is high in sugar, which can easily start to affect aquarium water. Because of this, it’s generally recommended to only give fish vegetables.

How do I make prepared fish foods?

Feeding vegetables to fish is quick and easy! Depending on the type of veggie you’re giving, you may need to cut it up into small pieces. These pieces can then be washed and added directly to the tank or blanched and saved for later.

Why didn’t my fish eat vegetables?

Every fish is different and yours might not enjoy vegetables! Instead, you can supplement those vitamins and minerals with algae wafers or pellets.

How do I make prepared fish foods?

Feeding vegetables to fish is quick and easy! Depending on the type of veggie you’re giving, you may need to cut it up into small pieces. These pieces can then be washed and added directly to the tank or blanched and saved for later.

Why didn’t my fish eat vegetables?

Every fish is different and yours might not enjoy vegetables! Instead, you can supplement those vitamins and minerals with algae wafers or pellets.

Can saltwater fish eat vegetables?

Yes! Saltwater fish can also be given vegetables even though they’re unlikely to experience plant matter in their natural habitats. Because of this, saltwater fish are more likely to ignore vegetable offerings, but some might take a nibble.

Instead, saltwater fish can be offered different types of macroalgae and seaweed sheets. The most common type of veggie before Nori was popular was romaine lettuce.

Conclusion

Most fish love a selection of fresh veggies in addition to their staple fish flakes or pellet, though some fish don’t! These vegetables can be served raw or blanched and frozen for later use. Some options include lettuce, peas, carrots, and broccoli, but an algae wafer will substitute for more picky fish.

Keep in mind that feeding fresh veggies can be messy and not all fish will enjoy the offer! Uneaten food should be removed if left untouched after a couple of hours.

🐟 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.
February 24, 2024
Zebra Danio Tank Mates: My 21 Picks After Years in the Hobby
I’ve kept zebra danios and they’re about as bulletproof as freshwater fish get. hardy, active, and incredibly easy to care for. But that high energy level is exactly what trips people up when selecting tank mates. These fish need space to zoom around, and I wouldn’t attempt a community setup in anything smaller than a 20-gallon tank. Add in their preference for cooler water and you have two things most people don’t think about until it’s too late. In this guide I’ll walk you through my 21 top picks. and the combinations to avoid.
Key Takeaways
- The zebra danio is a hardy, active fish that can be kept with a variety of species.
- These fish do best in a coldwater setup but can be acclimated to warmer conditions.
- Some of the best zebra danio tank mates are tetras, rasboras, and corydoras.
- Tank mate species to avoid include bettas, aggressive cichlids, and fish with large mouths.
Intro

Before we can talk about tank mates, we need to understand zebra danio care.

Zebra danios, scientifically known as Danio rerio, are highly adaptable freshwater fish native to many regions throughout Asia. These fish can be found in cold to hot fast-moving or stagnant conditions across India, Pakistan, Nepal, Bangladesh, and Bhutan; they have been introduced to many other regions of the world, including South America and North America. They usually live alongside vegetation but don’t rely on it for survival¹.

These freshwater fish grow to be about 1 to 2 inches on average and are named after the alternating silver and bluish-black horizontal stripes along the sides of their body. They have a torpedo-shaped body that helps propel them through the water.

Zebra danios are a very important species for science. They are considered a scientific model organism, which allows for many avenues of biological study. In fact, a zebra danio has even been sent to outer space! Interestingly, there is also evidence that zebra danios have memory, which means that they may experience some level of consciousness.

Tank Size

It is no wonder why the zebra danio is a favorite addition to the aquarium setting due to its high adaptability. These are easy-to-keep fish that bring a lot of movement to the upper portions of the aquarium.

Zebra danios are a schooling fish, which means that you need to allow space for at least 6 or more individuals. In general, a school of zebra danios can comfortably fit in a 10 gallon aquarium with minimal other fish. However, a 20 gallon long aquarium will allow for a bigger school as well as other tank mates.

Aqueon 20 Gallon Tank

A classic 20 gallon aquarium in its 30 inch long variant. A very popular aquarium.

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Water Temperature

One of the most important aspects to keep in mind when keeping zebra danios is their need for cooler water conditions. While these peaceful fish have been documented across a 50 degree range, they seem to do best when the water temperature is kept stable between 65-82° F.

⚠️ The biggest tank mate mistake I see: Fishkeepers pair zebra danios with tropical fish that need warmer water, or slow-moving species that can’t handle their energy. Danios are fast and constantly on the move. timid or slow fish will be stressed by them. Always match both temperature range and activity level when choosing tank mates, and remember: nothing smaller than a 20-gallon if you want this to work.

The Top Zebra Danio Tank Mates

Now that we have some understanding of where zebra danios come from and how they live in both their natural habitat and in the aquarium, we can start to consider some tank mate options.

The best zebra danio tank mates will be able to live with an active fish in colder-than-normal water temperatures.

1. Harlequin Rasboras

Harlequin Rasbora

A peaceful schooling fish. An ideal community fish. A great beginner fish

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- Scientific Name: Trigonostigma heteromorpha
- Tank Size: 10 gallons
- Adult Size: 1-2 inches
- Water Temperature: 71-80° F
- Temperament: Peaceful
Harlequin rasboras are small, colorful orange and black fish that resemble tetras. They are schooling fish that need to be kept in groups of at least 6 or more. Together, they are active swimmers that will stay in the middle portions of the aquarium.

With more active fish, like the zebra danio, harlequin rasboras may school tighter together and be less active. However, with a larger tank, the two species will complement each other in terms of activity and color.

2. Cory Catfish
- Scientific Name: Corydoras spp.
- Tank Size: 10 gallons
- Adult Size: 1-5 inches
- Water Temperature: 70-80° F
- Temperament: Peaceful
There are many different species of corydoras available in the aquarium hobby, coming in a variety of sizes. These are bottom-dwelling fish that like to school far away from zebra danios at the top of the water column. This distance, in addition to cories preferring slightly cooler-than-normal water conditions, makes them a good pairing for zebra danios.

🏆 My top pick for a zebra danio tank mate: Cory catfish are my go-to recommendation. they occupy the bottom while danios work the top, so there’s zero competition for space. The shared preference for slightly cooler water makes the parameter match easy too. I’ve seen this pairing work beautifully, and it’s the first thing I suggest to anyone setting up a danio community tank.

Some of the most popular Corydoras options include the bronze cory (Corydoras aeneus), pygmy cory (Corydoras pygmaeus), panda cory (Corydoras panda), and Sterba’s cory (Corydoras sterbai).

3. Mollies
- Scientific Name: Poecilia spp.
- Tank Size: 15 gallons
- Adult Size: 3-5 inches
- Water Temperature: 72-82° F
- Temperament: Peaceful to semi-aggressive
Mollies are one of the most popular freshwater fish. Mollies are large fish that come in almost every color, with many different varieties available.

They not true schooling fish, but they do enjoy the company of at least two to three others. This, in addition to their size, means that they are good feature fish for tanks over 10 gallons.

It is important to note that while mollies are often seen as community tank fish, they are capable of showing aggression to other fish and each other, especially if there are multiple males in the tank during breeding times. They also prefer the upper portions of the water column. Because of this, it’s important to watch how your mollies and zebra danios interact.

4. Swordtails
- Scientific Name: Xiphophorus hellerii
- Tank Size: 20 gallons
- Adult Size: 3-6
- Water Temperature: 64-82 °F
- Temperament: Peaceful to semi-aggressive
Swordtails are very similar to mollies in terms of color, activity, and behavior. These fish come in all different color variations and are easily recognized by their extended tail fin. They can also be kept in cooler water temperatures.

These fish are not a schooling species but exhibit shoaling behaviors in small groups with one male and several females. Swordtails are relatively active fish that like to stay in the upper portions of the aquarium. They can become aggressive towards other fish and their own if more than one male is present.

While swordtails are generally peaceful towards zebra danios, hobbyists should look out for possible fin-nipping and competition during feeding times.

5. Neon Tetras

Neon Tetra

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One of the most popular freshwater community schooling fish available in the aquarium trade. Great neon blue colors!

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- Scientific Name: Paracheirodon innesi
- Tank Size: 10 gallons
- Adult Size: 1.0-1.5 inches
- Water Temperature: 72-82° F
- Temperament: Peaceful, shy
Neon tetras get along with most freshwater fish, and zebra danios are no exception. These small red and blue fish can be timid, especially when kept in smaller groups. Luckily, they only grow to be about an inch big, which allows for more room for keeping a bigger school. This is necessary as zebra danios can potentially stress them out.

The good news is that neon tetras and zebra danios generally live in two different areas of the tank. Neon tetras usually stay in the middle and lower portions of the aquarium, away from the hustle and bustle of danios. Still, some extra decorations and hiding spots might encourage your tetras to be more present.

6. Rummy Nose Tetras

Rummy Nose Tetra

An easy to care for Tetra fish that loves to school. Very peaceful fish that are great for beginners

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- Scientific Name: Hemigrammus bleheri
- Tank Size: 10 gallons
- Adult Size: 1-2 inches
- Water Temperature: 75-85° F
- Temperament: Peaceful, active
Rummy nose tetras have a similar appearance and behavior to the zebra danio, but they’re a little more challenging to keep. These peaceful fish are identifiable by their bright red faces and can be seen swimming in schools in the upper portions of the water column.

While rummy nose tetras make a good option for a zebra danio community tank, they are much more sensitive to incorrect and changing water conditions than other fish species. These fish do especially well in bigger groups in a heavily planted tank.

7. Apistogrammas

Apistogramma cacatuoides” class=”wp-image-1059938″/>
- Scientific Name: Apistogramma spp.
- Tank Size: 20 gallons
- Adult Size: 2-3 inches
- Water Temperature: 72-86° F
- Temperament: Semi-aggressive
If you want another fish species to be the star of your aquarium instead of your zebra danio school, then an Apistogramma cichlid might make the ideal tank mate. These dwarf fish are from South America and are one of the more peaceful species of cichlid available. They have a moderate temperament but will readily tolerate other small, peaceful fish.

The trick to choosing good Apistogramma tank mates is selecting fish that can’t be mistaken for another cichlid and that stay out of their way during breeding periods. This makes the zebra danio a good option.

8. Chili Rasboras

Chili Rasboras

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

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- Scientific Name: Boraras brigittae
- Tank Size: 10 gallons
- Adult Size: <1 inch
- Water Temperature: 70-82 °F
- Temperament: Peaceful, shy
If you’re looking for something even smaller than the zebra danio, chili rasboras are about as tiny as you can get. There are a few considerations that will need to be made before making these two tank mates, though.

Chili rasboras are extremely small fish that grow to be less than an inch big. They love to school at the top of the water column but will scatter if threatened. Unfortunately, this can sometimes become problematic if you have an especially active or bold zebra danio.

If you find that your chili rasboras are overwhelmed by your zebra danio school, then you may need to increase the size of your rasbora school, add more plants, or reconsider rehoming one of the species.

9. Ember Tetras

Ember Tetra

A small red tetra that grows up to 1.25 inches. A very peaceful schooling fish

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- Scientific Name: Hyphessobrycon amandae
- Tank Size: 10 gallons
- Adult Size: 1 inch
- Water Temperature: 72-80 °F
- Temperament: Peaceful
While not exactly the same, ember tetras are a good (and cheaper) alternative to chili rasboras. These two fish share some of the same orangey-red colors and ember tetras only grow to be a little bigger.

Unlike chili rasboras, ember tetras are hardy fish that prefer the middle and lower portions of the water column. They take comfort in a school of 6 or more and can withstand the activity of a zebra danio school.

For most hobbyists, ember tetras are a better addition to the zebra danio community tank than chili rasboras.

10. White Cloud Minnows

White Cloud Mountain Minnow

A very peaceful fish that does well in coldwater fish. Other minnow varieties are also available

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- Scientific Name: Tanichthys albonubes
- Tank Size: 10 gallons
- Adult Size: 1-2 inches
- Water Temperature: 57-72°F
- Temperament: Peaceful, active
White cloud minnows are one of the best zebra danio community tank mate options, period! This is because their tank size, adult size, water temperature, and temperament all align.

White cloud minnows are not tropical fish and are instead, minnows. This means that they are incredibly hardy fish that can withstand a wide range of water temperatures and parameters. They are also active schooling fish that enjoy their own company and that of other fish species.

11. Boesemani Rainbowfish
- Scientific Name: Melanotaenia boesemani
- Tank Size: 40 gallons
- Adult Size: 4-5 inches
- Water Temperature: 72. 77° F
- Temperament: Peaceful, active
The Boesemani rainbowfish and the zebra danio is an odd pairing, but it’s doable! Both of these species are very active and a larger tank will be needed to comfortably keep both. While zebra danios will mostly stay towards the top of the tank, plenty of room should also be allowed for an active school of rainbowfish in the middle.

This is an unusual pairing mostly due to color and activity levels. As long as temperatures match and there is room to swim, Boesemani rainbows can live alongside zebras.

12. Cherry Barbs

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
- Tank Size: 25 gallons
- Adult Size: 2 inches
- Water Temperature: 73. 81° F
- Temperament: Peaceful, sometimes shy
Cherry barbs are one of the most ideal tank mates for zebras! Similar in size and activity, these two fish can comfortably live together as cherry barbs prefer the lower areas of the tank.

That being said, these small barbs can sometimes be shy fish. It’s best to keep these fish in a larger densely planted tank with a good-size school. They can be somewhat sensitive to water parameters, so they should be safely acclimated and kept with good tank husbandry.

13. Hatchet Fish
- Scientific Name: Gasteropelecus sternicla
- Tank Size: 20 gallons
- Adult Size: 2-3 inches
- Water Temperature: 72-81° F
- Temperament: Peaceful
If you’re looking for another fish to keep your zebra danios busy at the top of the tank, the hatchet fish will always be found just below the surface. While they don’t have the best vibrant colors, hatchet fish are one of the most interesting-looking fish species available!

These fish are great for community tanks but need a tight aquarium lid as they’re notorious jumpers.

14. Kuhli Loach

Kuhli Loach

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

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- Scientific Name: Pangio kuhlii
- Tank Size: 20 gallons
- Adult Size: 3-4 inches
- Water Temperature: 73-86° F
- Temperament: Peaceful
No matter your tank setup, there is always room for a kuhli loach. These fish are incredibly silly and fit right in at the bottom of a community tank setup.

Kuhli loaches aren’t true schooling fish, but they thrive in the company of their own. It is important to take careful consideration when introducing kuhli loaches into community tanks as hobbyists sometimes keep them at higher-than-normal water temperatures.

Always make sure to keep an aquarium lid on to prevent your loaches from escaping!

15. Platy Fish
- Scientific Name: Xiphophorus maculatus
- Tank Size: 10 gallons
- Adult Size: 2-3 inches
- Water Temperature: 64-77 °F
- Temperament: Peaceful, prolific
Platy fish are one of the most popular species of freshwater fish for beginner hobbyists and are one of the best tank mates for zebra danios. These community fish are colorful, active, and unbothered by other active species.

However, platy fish are incredibly prolific and can quickly overpopulate an aquarium. This, in addition to being overall messy fish, can cause water quality problems.

As long as populations and water quality are kept in check, then platy fish can comfortably live with zebra danios and an assortment of other fish!

16. Otocinclus

Otocinclus Catfish

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

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- Scientific Name: Otocinclus spp.
- Tank Size: 20 gallons
- Adult Size: 2-4 inches
- Water Temperature: 74-79°F
- Temperament: Peaceful, shy
Unlike the zebra danio, otocinclus are not beginner fish. In fact, these are some of the most difficult fish to keep due to their constant need for natural algae.

Otocinclus are smaller fish that rely on each other for safety. They need to be kept in groups of at least 6 or more and need an established aquarium with plenty of natural biofilm. A densely planted tank is a must.

Because these are some of the most challenging fish to keep and zebra danios are one of the easiest, these two species are not seen together often.

17. Cardinal Tetras

Cardinal Tetra

A very popular schooling fish. Looks like the Neon Tetra, but with longer blue and red stripes. Grows larger than a neon tetra as well

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- Scientific Name: Paracheirodon axelrodi
- Tank Size: 10 gallons
- Adult Size: 1-2 inches
- Water Temperature: 73-81° F
- Temperament: Peaceful
Slightly larger but more sensitive than neon tetras, cardinal tetras are great tank mates for danios. Cardinal tetras are colorful schooling fish that can be somewhat sensitive to both water quality and overactive tank mates. However, if they’re kept in a big enough school, they will feel safe to explore all corners of the tank, including where your zebra danios like to swim.

Cardinal tetras don’t have any special considerations, but they do best when acclimated and kept with live plants.

18. 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
- Tank Size: 10 gallons
- Adult Size: 2-3 inches
- Water Temperature: 74-82° F
- Temperament: Peaceful
The honey gourami is a great feature species for a zebra danio tank. These fish are big and bold but gentle giants. Honey gouramis can be kept alone or in pairs, as long as the tank size allows.

For the most part, the honey gourami makes a great tank mate for danios. Always make sure to keep an eye out for any potential fin-nipping between the two species. Zebra danios might take some interest in their thread-like pelvic fins.

19. Nerite Snails

Tiger Nerite Snails

These Nerite Snails will eat algae, are plant safe, and do not reproduce in your aquarium!

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- Scientific Name: Neritina spp.
- Tank Size: 10 gallons
- Adult Size: 1-2 inches
- Water Temperature: 65-85° F
- Temperament: Peaceful
If you don’t want to keep other fish with your danios, then nerite snails are ideal tank mates! These snails can’t reproduce in freshwater, so you don’t need to worry about them overpopulating. They are also efficient cleaners and will help keep the tank clean of any algae or uneaten food.

20. Bristle Nose 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 cirrhosus
- Tank Size: 30 gallons
- Adult Size: 5 inches
- Water Temperature: 73-80°F
- Temperament: Peaceful
If you want a cleanup crew member that’s a little more exciting than a snail, then bristle nose plecos are a great addition to the freshwater aquarium. These plecos grow to reasonable sizes and don’t need a pure vegetation diet. Instead, they’ll help keep the tank clean of leftover food and other organic debris, though they won’t clean up fish waste.

21. Other Danios

If you’re a danio fan, then there are a few other species you can safely keep with your zebra danios. While there aren’t many species of danio available in the aquarium hobby, some of the most popular include:
- Giant danio (Devario aequipinnatus)
- Pearl danio (Danio albolineatus)
- Glowlight danio (Danio choprai)
- Blue danio (Danio kerri)
Apart from the giant danio, all of these species should have similar tank requirements, though exact specifications are needed.

Bad Selections

Though there are many great tank mates for zebra danios, there are a few that will never be compatible. Here are some species to avoid.

Bettas

Betta Fish” class=”wp-image-34308″/>

Betta fish are aggressive fish that need their space. The last thing a betta will tolerate is a zebra danio zooming around its territory.

These two fish are incompatible tank mates due to territorial aggression and overactivity of the Danio that will stress out the Betta.

Aggressive cichlids

Texas Cichlid” class=”wp-image-553069″/>

For the same reasons, zebra danios will never be compatible with aggressive cichlids, like most African Lake species. Not only will these cichlids see danios as a threat to their territory, but they’ll also see them as food.

Anything Big

That brings us to this next generalization. A zebra danio should never be kept with any species that could fit one of these small fish into its mouth.

A zebra danio can easily entice a predator as it zooms across the tank and be mistaken for food as a result. For this reason, it’s best to keep these danios with similar-sized tank mates.

FAQs

What fish can you keep with a zebra danio?

There are many fish that can be kept with zebra danios, but small tetras, rasboras, catfish, and loaches are some of the best choices! When picking a new fish for your zebra danio tank, water temperature and activity levels are the main factors to take into consideration.

How many zebra danios should be kept together?

These danios need to be kept in groups of at least 6 or more. Keeping less than this can cause individuals to become stressed out and reclusive. This might even lead to a premature death.

Are zebra danios good community fish?

Yes! Zebra danios are some of the best community fish available. These fish are extremely hardy and can be kept with most community species.

Are danios fin nippers?

Zebra danios can be fin nippers. It’s best to avoid long-finned tank mates or to increase the size of the school instead. This should help diffuse possible aggression.

Can danios go in a tropical tank?

Yes, zebra danios can be slowly acclimated to a warmer tank even though they prefer cooler temperatures.

Conclusion

Zebra danios are widely available fish. While they’re not the most colorful fish, they have bold stripes that catch the eye as they zoom across the tank. These fish are highly active and should be kept with tank mates that can tolerate their behavior. Luckily, many coldwater and freshwater species check this box!
February 24, 2024
How Long Do Fish Live? What I’ve Learned After 25 Years in the Hobby
After 25 years in this hobby, I’ve seen fish live surprisingly long lives. and heartbreakingly short ones. Koi are the most extreme example: there’s a famous koi named Hanako that was reportedly over 200 years old. But even in a home aquarium, the difference between a fish living 2 years versus 10 comes down to a handful of key factors. Diet and living conditions are the two biggest ones I’ve seen in my experience. In this guide I’ll break down the average lifespans of the most popular aquarium fish. and what actually determines how long they live.

How Long Do Fish Live (By Category)

There are over 30,000 fish species on the planet, ranging from tiny nano species to the majestic 60-foot whale shark¹. Their lifespans seem to vary as much as their size and appearance, with some species surviving just a few months and others living for centuries! Check our video above for visuals from our YouTube Channel. We go over in more detail in our blog post so you can follow along with both!

The average aquarium fish lives a few years with good care, although some species can live for a few decades. After reading this guide, you’ll see that there’s a lot of variation between the species.

Size And Growth

Unlike humans, fish are indeterminate growers, which means they continue to grow throughout their lives. It can be difficult to guess the age of a fish over at the pet store, but you can bet a large specimen has already reached a good age.

Scientists have a more precise way of judging a fish’s age. They simply count the rings on their scales, kind of like the way you tell the age of a tree². Unfortunately, there isn’t a lot of concrete scientific evidence about aquarium fish lifespans out there, so most of what we know comes from the experiences of other fish keepers.

Of course, many factors can affect how long fish live. For example, a fish that can live for ten years might survive just a few hours in a tank with incorrect water temperature, or it could surprise you and live for 12 years.

We’ll discuss some of the factors that affect fish longevity later in this post, but for now, let’s go ahead and dive into the average life expectancies of some popular aquarium fish you might consider keeping in your tanks.

Small Fish Lifespans

Smaller fish tend to have short lifespans, although some nano species can live surprisingly long! You could expect your pets to reach these lifespans with good care and a bit of luck:
- Betta fish/Siamese fighting fish: 2-4 years
- Cherry barb: 4-7 years
- Corydoras catfish: 5-15 years
- Danios: 2-5 years
- Dwarf pufferfish: 3-5 years
- Gouramis: 4-8 years
- Guppy: 2-3 years
- Hatchetfish: 2-5years
- Japanese Ricefish: 3-4 years
- Killifish: 1-3 years
- Kuhli loach: 10-14 years
- Neon Tetras: 2-5 years
- Otocinclus catfish: 5-8 years
- Rams: 2-3 years
- Rasboras: 5-8 years
- Platy: 3-4 years
- Scarlet badis: 3-6 years
- Tiger barbs: 4-6 years
- White Cloud Mountain minnow: 7 years
Medium Species

The average medium-size fish lifespan is between 5 and 15 years, which makes this group of fish a similar commitment to other popular pets like cats and dogs. Read on to learn about some popular medium aquarium fish lifespans.
- African Cichlids: 5-10+ years
- Angelfish: 10-12 years
- Blood Parrot: 5-15 years
- Blue Acara: 8-10 years
- Bristlenose pleco: 10-15 years
- Common Goldfish: 10-15 years
- Convict Cichlid: 8-10 years
- Discus cichlid: 10-18 years
- Fancy goldfish: 10-15 years
- Glass catfish: 7-8 years
- Jack Dempsey: 10-15 years
- Molly: 3-5 years
- Rainbowfish: 5-8 years
- Rainbow shark: 5-8 years
- Siamese Algae Eater: 5-10 years
- Silver dollar: 10 years
- Swordtails: 3-5 years
Large Species

Larger fish tend to live longer, although they need proper care and a suitable aquarium to reach their full potential. Let’s take a look at some big fish lifespans.

💡 A lifespan that still blows my mind: Koi are the most extraordinary example of fish longevity in the hobby. The famous koi Hanako was reportedly over 200 years old when she died in 1977. verified by scale ring analysis. Most koi in home ponds already live 25. 35 years with good care, which is remarkable for any fish. It’s a powerful reminder of just how much proper conditions matter.
- Arowana: 10-20 years
- Bala shark: 10 years
- Bichirs: 10-15 years
- Black ghost knife fish: 10-15 years
- Blood Parrot: 5-15 years
- Clown loach: 10-15 years
- Dojo loach/Weather loach: 10-15 years
- Flowerhorn cichlid: 8-12 years
- Koi fish: 25-35 years, but can over 60 years!
- Oscars cichlids: 10-15+ years
- Plecos: 10-20 years
- Red-tailed Catfish: 15-20 years
- Severum: 10 years
- Tinfoil Barb: 8-10 years
- Tire track eel: 8-18 years
Wild Species

Just in case you were wondering how aquarium fish stack up against wild species, here’s a list of some well-known wild fish and their lifespans:
- Atlantic Salmon: 5-8 years
- Bluegill Sunfish: 5-8 years
- Common Carp: 25-50 years
- Largemouth Bass: 10-15 years
- Rainbow Trout: 5-7 years
- Sturgeon: 50-60 years
Aquarium Invertebrates and Other Aquatic Animals

Fish are not the only animals that live in fish tanks! Continue reading to learn about some other aquatic pet lifespans.
- Cherry shrimp: 1-2 years
- Snails: 1-10 years
- Dwarf Frogs: 5-15 years
- Turtles: 20-40 years
- Axolotls: 10-15 years
9 Factors that Affect Fish Lifespans

The lifespans listed above are possible with good care and a healthy specimen, but tropical fish often live a much shorter lifespan than you might expect. There are many factors that can determine your pet’s longevity, and many of them are in your control as a fish keeper.

Continue reading to learn about nine factors that can increase or decrease aquarium fish longevity.

1. Age At Purchase

This one might seem pretty obvious, but young fish can live longer than old fish.

Most of the fish you see in the pet store are just a few months old, which means they still have most of their expected lifespan ahead of them. The large, mature specimens you see sometimes are much older, and it can be difficult to tell their age.

Young fish may be more fragile and susceptible to damage than mature specimens, but if you can get them through the acclimation period and the first few weeks in their new tank, these fish can survive for many years.

2. Stocking

Bullying and fighting between the fish in your tank can cause stressful living conditions and reduce your fish’s lifespan. Some fish tend to be more aggressive than others, and you really want to avoid these species when setting up a community tank.

I recommend stocking your tank with peaceful fish that grow to a similar size. This will also prevent any fish from getting snacked on. Remember, big fish eat little fish!

3. Physical Size

If you’ve already scanned through the list of fish and their lifespans, you probably noticed a general trend. Medium-sized fish live longer than small fish, and big fish live even longer.

Most small fish live about three to five years, while large species like koi can live for several decades. There are exceptions, of course. Kuhli loaches can live surprisingly long for their size!

Tank size can play an important role in fish lifespans too. Keeping large fish in a small tank will lead to cramped conditions, poor water quality, and a reduced life expectancy.

4. Genetic Factors And Fancy Breeds

Genetics plays a big role in the lifespans of pet fish. Some betta fish live for over four years, although selective breeding has decreased the average lifespan of some varieties.

Some fancy breeds tend to have shorter lifespans than wild-type fish. This applies to fish like balloon mollies and some fancy goldfish breeds. These fish may be more prone to health issues that affect their internal organs, but they can still lead a full and healthy life with good care.

5. Water Quality

Poor water quality is probably the leading cause of reduced lifespans in pet fish. Keeping a tank clean and maintaining a healthy environment can be tough for beginner fishkeepers, especially if you start with sensitive fish species.

Understanding the aquarium nitrogen cycle and testing your aquarium water regularly will help you maintain a suitable environment and keep your fish healthy, but having the right equipment is also crucial. Tropical fish need good filtration and regular aquarium maintenance to keep their water safe and achieve their full potential life span.

6. Water Parameters

Poor water quality is a major cause of fish mortality, but even well-maintained aquariums can be dangerous for some fish species.

Each fish species has evolved to live in a certain range of water chemistry parameters. Some fish are highly adaptable, while others won’t survive unless you recreate their preferred conditions. Of course, freshwater fish should not be mixed with saltwater fish and vice versa!

I suggest testing the pH level and water hardness of your local water supply before choosing your fish species. It is possible to alter your water chemistry or use bottled or reverse osmosis water in your tanks, but it’s always easiest to choose freshwater fish that will thrive in your local water.

7. Temperature

Incorrect water temperature can reduce fish lifespan to just hours, so this is one factor I really can’t stress enough. Tropical freshwater fish come from warm water habitats, so most fish keepers will need an aquarium heater to keep these fish healthy.

However, you probably won’t need a heater if you live in a tropical region, or keep your home at a constant temperature between about 75 and 80 degrees Fahrenheit. Fish temperature preferences vary depending on the species, so always research the needs of each individual fish species before adding them to a community tank with other fish.

8. Health Problems

Fish are susceptible to various illnesses that can reduce their lifespan. Common diseases include bacterial infections, fungal infections, viruses, and parasitic infections like ich that cause white spots.

Aquarium fish are most vulnerable to health problems when their water quality is low, but they can also develop illnesses when kept in unfavorable water parameters or with unsuitable tank mates.

Disease outbreaks can occur when you add a new fish to your aquarium, so it’s best to confine new fish to a quarantine tank before introducing them to your community aquarium. That way you can monitor your new pet fish for a few weeks and treat them with veterinary medicine if necessary.

9. Diet

Diet quality is another important factor that can increase or decrease your fish’s life expectancy. Different species of fish have different dietary needs, so you may need to provide more than one type of food if you keep multiple species of fish.

⚠️ The three mistakes I see most often that cut fish lifespans short: First, keeping fish in a tank that’s too small. chronic stress and stunted growth take years off their lives. Second, poor or monotonous diet. fish need variety and species-appropriate food to thrive. Third, bad tank mates that cause constant stress or injury. I’ve watched all three of these shorten the lives of fish that could have lived much, much longer.

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Modern prepared fish foods contain just about everything your fish need to stay healthy, but you can also supplement their diet with some healthy treats. Carnivorous and omnivorous fish love live or frozen foods like bloodworm and brine shrimp, while omnivorous and herbivorous fish species enjoy healthy snacks like peas and zucchini.

FAQs

How long does a pet fish live?

Depending on the species, most pet fish with live between 1 and 15 years with good care. The average nano fish will live between 3 and 5 years, while medium fish species have longer lifespans in the 5-15 year range.

How long do fish live naturally?

Fish in the wild probably live shorter lifespans than captive fish because they are exposed to more predators and dangerous environmental factors like floods, droughts, and cold snaps. Captive fish can live a surprisingly long life if kept in a clean tank with stable conditions and a high-quality diet.

Which fish species has the shortest lifespan?

According to the Guinness Book of Records, the fish with the shortest lifespan is the seven-figure pygmy goby. These tiny saltwater fish complete their entire life cycle in less than two months!

In the aquarium hobby, livebearers like guppies and platies tend to have shorter lifespans than similar-sized egg layers like the neon tetra. The average guppy has a lifespan of just two to three years.

Which fish live the longest?

The longest-living fish species is the Greenland shark, a species of deep, cold waters in the open ocean. These huge sharks can reach about 23 feet and live for over 400 years! This is one fish you probably don’t want in your home aquarium.

Which fish has the longest lifespan?

Goldfish are about the longest-living aquarium fish species, and some specimens will live over 25 years with proper care.

Koi can live even longer, although these beautiful fish from the carp family are usually housed outdoors in ponds. Their average lifespan is about 25 to 30 years, although one incredible specimen called Hanako is said to have lived for 226 years!

Final Thoughts

Fish lifespans vary between species, but you can use this guide to make a pretty educated guess about how long your fish will live. Of course, you’ll need to provide consistent care if you want your pets to reach their full potential, so check out my extensive range of fish care guides for loads of great advice!

How old is your oldest fish? Let me know in the comments below!

🐟 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.
February 18, 2024
Can Angelfish and Bettas Live Together? Why I Always Tell Customers to Avoid It
I’ve never personally attempted this combination. and after 25 years in the hobby, that’s a deliberate choice. I’ve heard the aftermath from customers who came into the fish store after things went sideways with this pairing. The core problem is size and temperament: angelfish are significantly larger than bettas, and while bettas have a reputation for aggression, they’re actually the ones that come off second best when an adult angelfish asserts itself. My advice: skip this combo entirely. This guide explains exactly why. and what to do if you’re already in this situation.
Key Takeaways
- Betta fish and angelfish are not recommended as tank mates.
- Some aquarists may have successfully housed these fish together in larger aquariums (55-gallon +) but it’s important to have a spare tank ready in case you notice any signs of aggression.
- Bettas can be aggressive, but they are slow swimmers and stay much smaller than angelfish, so they are more likely to be the victim in an aggressive encounter.
Can Angelfish And Bettas Live Together? – No!!!

Here’s your quick answer. In the vast majority of cases, Bettas cannot live with Angelfish in the same tank. Now that you know the answer, let’s go into why it doesn’t work.

Why It Doesn’t Work

Let’s take a look at some of the issues you’re likely to face.

Tank Size

On paper, angelfish and betta fish prefer similar water parameters, so you might think they make ideal tank mates. However, these fish have very different tank size requirements.

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A classic 20 gallon aquarium in its 30 inch long variant. A very popular aquarium.

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You’ll need at least 20 gallons to house young angelfish and a 55 gallon tank for adults, but just 5 gallons or more to house bettas. So, you definitely can’t add angelfish to a small betta fish tank.

Aggression

Both angelfish and bettas can be aggressive fish, depending on their personalities. Both fish also have long fins, so they can be vulnerable to fin nipping.

However, a full grown angelfish is much larger than a betta fish, so if there’s any aggression, the betta is going to come off second best.

🚫 From my experience in the trade: This is the core of why the pairing fails. Bettas have a reputation as the aggressor, but next to a full-grown angelfish, that reputation doesn’t hold up. I’ve had customers come into the store after losing their betta to angelfish aggression they never saw coming. The size difference is just too significant. especially once the angelfish fully matures.

Angelfish can become especially aggressive during breeding, so if you have males and females, there’s even more risk of them harming your betta fish.

Illness

Aggression can turn your community tank into a toxic environment that is as stressful for you as it is for your fish. Unfortunately, aggression also causes illness and even death in pet fish.

A bullied fish often sustains minor injuries that leave them vulnerable to secondary infections. In some cases, aggressive betta fish or angelfish will even kill their victims outright!

Betta Basics

Betta fish (also known as Siamese fighting fish) are small freshwater fish that usually reach about 2.5 inches in length. Today, they are prized for their amazing colors and fancy fins, but these fish were once bred for competitive fighting.

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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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Bettas have a reputation for aggression, although they can make excellent community fish. A lot depends on their individual personality, but male bettas are likely to fight with their own species if housed in the same tank. It’s always safer to keep just one betta in its own aquarium, or with other compatible species.

Female bettas are generally regarded as less aggressive than males, although most fishkeepers choose males for their brighter colors and longer fins. You can learn much more about female bettas from my complete female betta care guide.

Betta fish live in shallow, freshwater habitats and have evolved to breathe air from the surface for survival¹. Their hardy nature means they can be kept in tanks as small as 5 gallons, although they require a filter and regular tank maintenance to provide good water quality. Bettas are tropical fish so they also need heated water to stay active and healthy.

Check out my guide to 15 betta fish tank mates (and four to avoid) for advice on some great freshwater fish that can share a tank with a Siamese fighter!

Facts and Figures
- Scientific name: Betta splendens
- Fish family: Osphronemidae
- Origin: Southeast Asia
- Diet: Carnivore
- Temperature: Upper 70s to mid 80s Fahrenheit
- pH: 6.8 – 7.5
- Hardness: Soft
Angelfish in a Nutshell

Angelfish are medium-sized South American fish from the cichlid family. These popular fish come in various color forms, but each breed has that characteristic combination of long dorsal and anal fins.

These fins make the angelfish very ‘tall’, so it’s best to keep these freshwater fish in an aquarium with high sides. In terms of size, these fish can reach over 6 inches in length and an impressive 10 inches in height, so a single fish will need a tank of at least 20 gallons, with 55 gallons being better for larger adults.

While angelfish are relatively peaceful, they are cichlids, and they aren’t always complete angels! These fish are typically classified as semi-aggressive but they can be pretty aggressive when they’re paired up and start breeding.

Freshwater angelfish are omnivores, and they have a pretty small mouth. However, they will eat nano fish small enough to swallow.

Looking for some great ideas for angelfish tank mates? Check out my guide to 15 freshwater species that get along with angelfish!

Facts and Figures:
- Scientific name: Pterophyllum scalare
- Fish family: Cichlid family
- Origin: Amazon river basin in South America
- Diet: Omnivore
- Temperature: Upper 70s to lower 80s Fahrenheit
- pH: 6.8 – 7.8
- Hardness: Soft
How To Keep the Peace

If you already have angelfish and betta fish in the same tank, there are some things you can do to decrease the chance of aggression. Again, there are no guarantees, but a combination of these techniques might help prevent war in your aquarium.

Go Big

A lot of compatibility problems are caused by keeping fish in small tanks. When it comes to angelfish and betta fish, your chance of success rises as you get into that 55+ gallon range, but remember, these fish are still not recommended as tank mates. You have safer bets in 6 or 8 foot long tanks, but at that size your Betta will get lost in the visual of the display tank.

Get the Parameters Right

Fortunately, bettas and angelfish thrive in similar conditions. Aim for a water temperature in the upper 70s Fahrenheit and a neutral pH around 7 to keep both fish happy. Both angelfish and betta fish prefer water with a low flow, so use an appropriate filter.

Start With Young Fish

Young angelfish do not have the same territorial and aggressive drive as breeding adults, so they’re often safer to keep together with bettas. Letting your fish grow up together might also help prevent aggression down the line, but you can still expect some dominance battles as they grow and reach maturity.

Female Bettas and Single Angelfish

Female bettas are generally less aggressive than males, and their shorter fins are less prone to damage. Paired angelfish can be more aggressive than single specimens, so a combination of one or more female bettas and a single angelfish might work the best, especially when combined with some of the other tips mentioned here.

Monitor Regularly

You should check in on aquarium fish every day, but risky combinations like betta fish and angelfish should be observed frequently, especially in the weeks after they are introduced. A community tank with betta fish and angelfish should be positioned somewhere you can monitor it throughout the day.

Watch out for any signs of aggression so that you can take action before serious injury can happen. Aggression often takes place during feeding times, so be especially alert when your fish are eating.

Feeding Your Fish

Adding food to different parts of the tank at the same time can reduce competition and conflict, but you should also be aware that bettas and angelfish have slightly different diets.

Betta fish are mostly carnivorous and will thrive on a diet of prepared dried food and live/frozen foods. Angelfish are more omnivorous so they need a prepared food suitable for their needs.

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Live Plants

Live plants are beautiful to look at, fun to grow, and great for the health of your fish. They’re also perfect for breaking up the line of sight in the tank. This means fish are not always visible to each other, which reduces aggression. Large plants also provide hiding places where fish can escape if they feel threatened or are under attack.

Choose large plants like Amazon swords, vallisneria, and large Java ferns that will grow up into the water column, but don’t be afraid to add a few smaller species and floating plants to make your aquarium an even more natural environment.

Vallisneria

One of the easiest background placement aquarium plants that can be kept. Provides excellent shelter for fish

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You can also use artificial plants, but avoid firm plastic decorations that can cut and damage your betta fish fins. Live plants are always better for bettas!

Caves And Structure

The hardscape in your tank can also play an important role in breaking up line of sight and creating hiding spots. Rocks, driftwood, cave ornaments, and other decorations provide places where fish can set up territories or hide from dominant tank mates.

Choose fish-safe ornaments that are made for aquariums to avoid introducing any chemicals into your tank. You should also check for any sharp edges that can tear your fish’s fins.

Dither Fish

Sometimes, the best way to avoid aggressive behaviors is to add more fish. Dither fish are active species that create movement and make it difficult for an aggressive fish to single out a victim. The best options are active schooling fish that swim at various levels in the tank.

Busy bottom dwellers like cory catfish, or fast, active fish like rainbowfish make good dither fish, but it’s important to choose other fish that enjoy the same parameters as angelfish and bettas. Avoid nano dither fish that are small enough for angelfish to swallow. You can also try medium sized social fish like molly fish.

Plan B – What To Do When War Breaks Out

If it doesn’t work out between your angelfish and betta, you’re going to have an animal welfare issue on your hands, and the best thing to do is separate your fish or find a new home for one of them.

You may already have a spare tank that you use for quarantining or treating sick fish, but if not, it’s always a good idea to have an emergency option. You could even use a bucket or something similar as a (very) temporary solution, just make sure the container has not been used to hold any toxic chemicals.

Once your fish are separated, it’s time to come up with a long-term solution. Continue reading to learn about three possible options.

Try A Tank Separator

Installing a tank divider will allow you to keep these two species in one aquarium without any drama, but it does limit the swimming space for both fish and all the other species in the tank. Fish tank dividers are available for sale, or you can make your own to save some money for your next tank.

✅ If you’re set on keeping both: A tank divider is the one scenario I can honestly endorse. It’s the only way to have both fish without risking conflict. That said, both fish will have reduced swimming space. so if you go this route, start with at least a 55-gallon tank so each side has enough room to live comfortably.

Budget Option

LifeWithPets Tank Divider

Budget Option
A DIYer’s option. Divide your aquarium and house multiple Bettas!

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With your fish separated in a single tank, you can start creating hiding spaces, adding more structure to break up their line of sight, and introducing live aquarium plants and dither fish.

If your fish still don’t get along after making some changes in the tank, you’re going to want to try one of these next options for a long-term solution.

Start A New Aquarium

Angelfish need much larger tanks than bettas, but you can create a great new home for a single betta fish in a tank as small as 5 gallons. This is usually the easiest and most cost-effective option, but it will limit your options for adding other species.

Male bettas are happy to live in their own tanks, but you’ll want to step up to a ten-gallon or larger if you plan on giving him some tank mates. Female betta fish can also be kept in their own tank, or you can keep a sorority of females in a larger aquarium.

There are great betta tank kits available, but you can also put your own tank together. Just don’t forget the heater and filter!

Starting a new tank is easier when you already have a cycled aquarium because you can seed your new filter with beneficial bacteria from the old tank to give the nitrogen cycle a jump start. However, you’ll still need to monitor your water parameters regularly, so keep that water test kit handy.

Check out my guide to fish-in cycling to make the transition as smooth as possible!

Rehoming

If your new angelfish isn’t getting along with your betta (or vice versa), and you don’t have the space for another aquarium, you might be able to return the fish to your local fish store. Call ahead and speak to someone at the store before taking your fish on another road trip.

Depending on their policy, you might not get a refund, but that’s still better than letting your fish get hurt. If the store has a no-return policy, you might want to ask any other fish keeping friends if they have space for a new fish or even put your pet up for sale to a good home.

Final Thoughts

So now you know why keeping angelfish and bettas together is a bad idea. Hopefully, you’ve also picked up some useful tips on how to keep the peace if you find yourself housing both species in the same tank.

While some fishkeepers have managed to keep these fish together successfully, I do not recommend trying it yourself. Rather check out my guides to angelfish tank mates and betta fish tank mates for some much safer options!

📘 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.

📘 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.
February 18, 2024
Fish Tank Ideas: 30+ Setups That Have Inspired My Own Builds
I’ve been keeping fish for over 25 years, and few things in this hobby beat the moment a tank design truly clicks. Aquascapes, cichlid rockscapes, and nano planted betta tanks have all inspired setups in my own fishroom over the years. and they still do. If you’re looking for your next build or just some inspiration for what’s possible, this is one of my favorite topics to cover. Here are 30+ fish tank ideas from across the hobby that I keep coming back to.
Key Takeaways
- Designing an aquarium is a great chance to let your creativity run wild and create something truly unique. However, drawing some inspiration from other setups can be very helpful.
- Aquarium decorations are a great way to add some style and personality to your aquarium, but live plants and natural materials like wood are the best choice for nature-style fish tanks.
- Stick to hardscape and decorations designed specifically for aquariums. Natural decorations like rocks can be used if you clean them carefully, but some natural materials like sea shells and limestone can change your water chemistry.
- Be sure to include a filtration system if you’re creating a shrimp or fish tank, and a heater if you’re keeping tropical species.
- Don’t be afraid to think out of the box! Paludariums and emersed planted tanks are excellent aquarium ideas.
Nano Fish Tank Ideas

In the aquarium hobby, small aquariums are usually referred to as nano tanks. How small is small? Well, the definition varies, but you can call anything smaller than about 20 gallons a nano tank.

There are many different nano tank styles, ranging from species-only setups to thriving communities. Continue reading for some nano tank inspiration!

10-gallon Nano Betta Fish Tank Idea

Betta fish are one of the most popular nano fish in the hobby, but we see them in tiny bowls and other containers way too often. This beautiful 10-gallon nano betta fish tank deserves a round of applause¹!

The combination of live aquatic plants, driftwood, hardscape, and a little beach area gives this tank a feeling of balance and tranquility. I bet that’s one happy betta.

5-Gallon Betta Setup

You can also go a little smaller for a single betta, although you’ll still need a filtration system and a heater. Maintaining high water quality will also become more challenging, but regular water changes and cleaning will keep your fish happy and healthy.

At 5 gallons, this well-planned fish tank is about the smallest you should go for bettas or other live fish. However, you can make a nano tank look much roomier than it really is by decorating it carefully.

Notice how the dark substrate makes the plants stand out even more? Black sand or gravel can also make fish look brighter and it’s great for some shy fish species that prefer a dark habitat.

🏆 My Pick: If I had to recommend one starting point for beginners who want to build something beautiful without overwhelming themselves, it’s the natural planted betta tank. The footprint is small, the cost is manageable, and the results can look incredible. I’ve set up many of these over the years and they never get old. it’s the best entry point into seriously impressive aquarium design.

Community Aquarium

It is possible to keep multiple nano fish species together in a small tank, but you’ll need to step up to an aquarium in the 15 to 20-gallon range to house your fish safely.

This elegant tank is home to multiple fish species and some beautiful aquatic plants. Most fish that grow to about 2.5 inches or less can be kept in this tank size, although it’s important to research the minimum school size and parameters of each species.

Themed

There are some awesome aquarium decorations out there for setting up a themed fish tank. Check out these fun but contrasting examples from across the web!

Spongebob

Spongebob-themed aquarium decorations can turn a nano tank into a fun and exciting fish tank, especially for the kids. This themed aquarium looks just like a scene from the popular TV show, and those yellow fish fit right in!

Bamboo Forest

Looking for something a little more zen? Check out this peaceful betta tank, complete with its own bamboo forest. This fish tank theme is perfect for your work desk, especially if you have a stressful job.

Planted Aquariums

If you ask me, all freshwater aquariums should include some live plants! Live plants have many benefits for your fish, and they look great too! Let’s take a look at some amazing planted tank eye candy.

Submerged Bonsai

Plants dominate this incredible aquascape, although its creator has chosen to create a scene that looks more like a dry landscape than an underwater scene!

It would take many years to grow an actual bonsai that looks this good, but by cleverly planting a small plant like Anubias barteri var. nana on a great piece of driftwood, you can achieve much faster results.

The addition of carpet plants and that inviting clearing under the ‘tree’ make this peaceful scene really aesthetic. Can you picture a few shrimp or a betta hanging out under the shade of those branches?

Dutch Style

This amazing Dutch style planted fish tank ticks all the right boxes for aquarists who like a lot of color! This orderly aquascaping style requires dedication and a real eye for design, but the results are incredible.

⚠️ A Word of Caution: The biggest mistake I see people make when trying to recreate a tank they found online is skipping the research on plants and aquascape layout concepts. Aquascaping has its own language. rule of thirds, foreground/midground/background layers, plant selection based on light and CO2 requirements. If you dive in without understanding these principles first, you’ll spend a lot of money on plants that die and layouts that fall apart. Study the style you love before you buy anything.

The rimless tank and open-top design add another dimension of viewing pleasure to this tank. Sometimes, plants look the best when viewed from above!

Dutch-style planted tanks are all about the plants, but that doesn’t mean you can’t add some movement. The vertical bars on those angelfish really complement this tank!

Emersed Growth

There’s something special about a planted tank with emerging plants. This stunning aquarium is a true underwater paradise, complete with lush vegetation growing out of the water, just as it does in nature.

Many common aquarium plants, including Ludwigia and Rotala, can be grown emersed in a hoodless tank with suspended lighting.

Fish safety is an important consideration when planning an open-top fish tank. Fish are surprisingly good at jumping out of tanks, so it’s a good idea to cover the top with some kind of screen.

Paludariums

Giving your plants the freedom to grow up and out of the water creates a unique look, but you can go even further and create a truly amphibious tank. Paludariums, like this exquisite example, include an underwater section and a land section.

Depending on the size and design of your paludarium, you could house aquatic life like fish, shrimp like red cherry shrimp, or dwarf frogs in the water. The land section is great for frogs, and turtles that like to spend time in and out of the water.

The land section of your paludarium could take the form of an island that sticks out of the water in the center, or you could add a simple shelf, complete with some rocks, soil, and plants.

The Living Wall

A planted wall is another spectacular design, although this limits some of the animals you can keep. This example provides some swimming space for shrimp or nano fish, and plenty of planting space for those awesome tropical plants.

African Cichlids

African cichlid tanks are the ultimate choice for freshwater aquarists who want a large tank that bursts with color and movement. Although you can grow some plants in African cichlid tanks, these setups are usually all about the fish.

Rock Pile

Some fishkeepers house African cichlids in pretty open, bare-bottom fish tanks, but if you ask me, these fish look so much better with some dramatic rocky hardscape!

This tank creates wonderful cichlid habitats and makes a bold statement as a display tank. The white sand contrasts with the round rocks to make this simple but effective tank really pop.

Just make sure you secure round rocks properly if you set up a tank like this, they could easily injure your fish or crack your tank if they come tumbling down.

Rock Walls

When we talk about aquarium hardscape, most people think of arranging and stacking r o cks or driftwood on the bottom of the fish tank. However, the back and side walls can be used to create an amazing effect.

You could simply use a life-like stick-on aquarium background, or go this route and create something with real texture!

Angelfish

Ang elfish are stunning freshwater cichlids that come from South America. These distinctive fish have a very ‘tall’ body shape, so they need a tank with some real height.

These fish thrive in planted tanks and can be housed with many other peaceful community fish in a big enough aquarium – just avoid tiny tank mates that your angels might see as a tasty snack.

Altum Angel Aquarium

This gorgeous designer fish tank is home to a big group of Altum angelfish, a large species native to the Rio Negro and Orinoco rivers in South America. The dramatic driftwood contrasts against a backlit background to make an aquarium that no one is walking by without stopping to stare!

Aquascapes

Most aquascapes include live plants, but you can also create a stunning scene by arranging hardscape features like rocks and driftwood. Let’s take a look at some interesting aquascapes.

Forest Scapes

This inspiring aquascape looks just like a forest scene from the great outdoors, complete with mountains! This kind of project takes real dedication and a lot of experience, but the results are absolutely amazing.

Iwagumi

This iwagumi masterpiece by George Farmer highlights the simple beauty of this unique aquascape design. Each rock is carefully arranged in the frame to create a simplistic yet bold look, and the dense carpet of plants only adds to its appeal.

This type of fish tank looks best with a small group of schooling fish like neon tetras, which create the effect of a flock of birds flying over the aquascape.

The Nature Aquarium

This jaw-dropping tank is a prime example of a nature aquarium. The style was popularized by the legendary Takashi Amano, a pioneering aquascaper from Japan. The style aims to create a unique natural world, rather than recreating a scene directly from nature.

A variety of different plant types are used in this style, but hardscape features like rocks, roots, and driftwood are equally important in creating different zones and textures in the tank.

Glofish Tanks

Have you ever heard of Glofish? These neon-colored fish were originally genetically modified to identify toxins in water, but today they are very popular in the aquarium hobby for their vibrant colors.

Neon Glow

Glofish come in exotic colors like sunburst orange, electric green, and galactic purple, and they include popular species like corydoras catfish, tetras, danios, and rainbow sharks. These fish really stand out under blue LED lighting, and so do the special glofish gravels, aquarium decorations, and artificial plants.

Nano Glofish Setup

Glofish tanks are a perfect idea for the kid’s room or anyone who loves bright colors! This low-maintenance example shows off the amazing colors you can achieve with the right lighting and some cool glofish tetras.

Goldfish

The goldfish is another freshwater species that looks nothing like their wild ancestors. Hundreds of years of selective breeding have created the amazing variety of fancy goldfish breeds we know today.

Some people still think goldfish can live in little fish bowls, but these fish actually grow surprisingly large, so they need a fish tank of at least 30 gallons for long-term care.

Keeping goldfish is all about the fish. These adorable underwater pets have a long lifespan, and it’s really rewarding to watch them grow and thrive in a healthy fish tank.

The Minimalist

Many aquarists choose to keep their goldfish in open, minimalist tanks like this setup because they are easy to clean and place all the attention on the tank inhabitants. The addition of that long airstone adds another layer of interest to this fish tank while increasing oxygen levels in the water.

Eastern Elegance

This 60-gallon goldfish aquarium still has a low-maintenance design but includes a little more structure, including some great aquarium decorations that reflect the goldfish’s east Asian origins.

60 gallons is a great size for two or three fancy goldfish, and you could even consider some goldfish tank mates in a tank of this size.

Check out my guide to 11 goldfish tank mates for some great goldfish companions!

Nature Style Goldfish Aquarium

Unfortunately, goldfish love to snack on most plants, but that doesn’t mean you can’t create a natural home for your fishy friends. Some attractive river stones and soft artificial plants or tough live plants like Java fern and Anubias look great in a goldfish tank.

Big Tank Inspirations

Most of us can only dream of the kinds of tanks in this next section. Oh well, it doesn’t mean we can’t drool over them! Keep reading to learn about some amazing aquariums from across the world.

Outdoor Koi Pond with Glass Front

Don’t have space in your home for a big fish tank? These fish-lovers went ahead and designed a Koi tank/pond hybrid, which combines the best of both worlds!

Large koi are traditionally viewed from above, but this stylish setup allows you to enjoy your fish from every angle.

Kanye West’s Bathtub Aquarium

Stepping back inside, Kanye West’s super-stylish bath-tub tank is a great example of creative aquariums.

This tank helps you feel like you’re swimming in nature, every time you take a bath. The tank is filled with some awesome fancy goldfish.

The Mirage

Now, if money or space isn’t a problem, you might want to go with an aquarium like this beauty from the Mirage in Las Vegas. This mega 20,000-gallon fish tank is home to over 80 species of saltwater fish from tropical waters across the globe.

Atlantis The Palm

Some hotels go one step further, and let their guests view their amazing aquariums from within their suites! The Lost Chambers Aquarium in Atlantis Dubai allows viewers to enjoy sightings of over 60,000 ocean animals in the Ambassador Lagoon, all from their own suite!

Final Thoughts

So there you have it, 25 fantastic fish tank ideas that you can use to design your next aquarium. You could choose a nano-themed aquarium filled with cool decorations, an aesthetic nature aquascape full of aquatic life, or splash out on an impressive celebrity-style installation – the choice is yours!

Which of these 25 fish tank styles do you like the most? Share your view in the comments below!

🔧 Want to learn more? This article is part of our complete Aquarium Equipment & Gear Guide. your ultimate resource for filters, heaters, lights, pumps, tanks, and more.
February 17, 2024
GloFish With Betta: Why It Almost Never Works (And the One Exception I’d Try)
GloFish and bettas in the same tank works sometimes and fails spectacularly other times. It depends entirely on the betta temperament and the GloFish species.

Some bettas ignore GloFish. Some attack them relentlessly. You will not know which you have until you try.
Key Takeaways
- The only GloFish that is compatible with a betta are GloFish cories.
- Bettas have particular requirements that do not mix well with other GloFish, like tank size, aggression, and overall compatibility.
- Many GloFish, like tetras, are known nippers and are ill-suited for a slow-moving, long-finned betta.
- Another alternative to getting an entirely new fish species is getting a GloFish betta instead!
The Quick Answer – Glofish With Bettas Don’t Work

The answer is mostly no. Many of the GloFish species available are incompatible with betta fish due to overactivity, aggression, or other behaviors that we will go over in this post. That being said, the GloFish corydoras are one of the most successful pairings.

What Are GloFish?

If you’ve ever gone to your local fish store, you might’ve seen blacked-out tanks with various fluorescent pink, yellow, orange, blue, and red fish. These are often different tetra, danio, barb, shark, and cory catfish species. You might find yourself asking what these fish are, whether or not they are safe to keep, and if they is kept with your other community fish.

GloFish are genetically modified fish that have been fundamentally altered to express their trademarked bright colors. Contrary to popular belief, GloFish are not injected with artificial dyes and do not have genetic defects, though consumers should be wary of off-market fakes.

Instead, GloFish DNA has been altered to express certain colorful traits that get passed down from one generation to the next, meaning that their colors will never fade. It should be noted that breeding GloFish is trademarked and should not be intentionally tried in the aquarium setting.

In general, GloFish are no more or less ‘safe’ to keep than the wild-type variety of the given species., bright individuals are just as hardy and adaptable as their regular-colored counterparts. There is a lot of discussion about the ethics of GloFish and what their adaptation could mean for the future of fishkeeping.

GloFish can safely be kept with a variety of tropical fish species. However, this isn’t done as they require special lighting, like a black light, for best viewing, which isn’t always best for other species. Because of this, many hobbyists set up a GloFish-only tank with a variety of compatible species.

Things To Consider

Pairing any fish with a male or female betta is tricky. These are individualistic fish with varying temperaments. Whether or not your betta fish is kept with other fish will depend solely on the personality of your fish.

There are a few ways to increase the likelihood of success, though.

Water Temperature

Betta fish enjoy a stable water temperature between 78 to 80° F. Most tropical fish options fall within this range, but some popular GloFish options, like zebra danios, do not.

Aquarium Size

No, betta fish cannot live in a bowl with GloFish. In fact, bettas should never be kept in anything smaller than a 5 gallon fish tank, with 3 gallons being regarded as the absolute minimum.

While a single male or female betta fish is happy in a small tank, any addition of a tank mate will call for a larger tank due to the betta fish’s natural aggression and territorial behavior.

Unfortunately, most GloFish varieties grow to be over 2 inches big and often need to be in a group, so a minimal 20 gallon aquarium is necessary to prevent territories from overlapping.

Temperament

In addition to tank size, temperaments will be the determining factor as to whether or not your betta fish will get along with other fish species. Male and female bettas, also known as Siamese fighting fish, are naturally aggressive fish as they try to protect their territories. They are willing to attack and sometimes kill intruders, especially if they have vibrant colors.

On top of aggression, overactivity is a problem for slower-moving bettas. Many of the GloFish species available are active swimmers, which can easily outcompete a long-finned male betta, especially during feeding times.

⚠️ Biggest Mistake: The most common error I see is people not knowing the original species behind the GloFish they’re buying. GloFish Danios are one of the worst choices. Danios are naturally fast, relentlessly active schoolers, and that constant darting motion stresses bettas out significantly. Many other GloFish varieties come from semi-aggressive base species with zero natural compatibility with bettas. Always look up the base species before adding anything to a betta tank.

The ideal temperament match would be a relatively docile betta with other shy but present fish.

Competition

All in all, a betta fish pairing is based on compatibility and competition. Water parameters must match and temperaments should align for different species to live in the same tank.

Though you might want your fish to interact together in the fish tank, it’s actually more ideal if they completely ignore each other.

Why Cories Work

Corydoras are one of the most popular freshwater fish available, with many different species coming in all shapes and sizes. These fish range anywhere from under an inch long to some reaching almost 5 inches.

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GloFish cories are derived from the bronze or green cory, Corydoras aeneus, which are arguably the most popular species available. Bronze cories grow to be about 2.5 inches long. They need a 20 gallon aquarium as they are schooling fish that need to be kept in groups of at least 6 or more. Corydoras are most active at the bottom of the aquarium, so a longer aquarium is better than a taller one.

Betta fish are known for their aggression and low-level activity. Any other fish that enters their territory, has similar coloration, or otherwise disrupts their natural float-through-life attitude can greatly stress them out. This is why GloFish cories can make great tank mates for bettas!

Corydoras are peaceful fish that stick with their schools at the bottom of the aquarium. This leaves a ton of space in between your betta fish, who likes to live in the upper portions of the aquarium, and your bottom-dwellers. However, this pairing cannot be kept in a regular 5 gallon tank meant for a solitary betta.

🏆 Mark’s Take: Cories are the rare GloFish exception that actually makes sense with a betta. They’re peaceful, they school at the bottom of the tank, and bettas naturally claim the top and middle. So they occupy completely different zones without ever needing to interact. I’ve seen this work well because neither fish has a reason to bother the other. Just make sure you have at least a 20 gallon tank and a group of 6+ cories so they feel secure enough to stay calm.

Instead, a GloFish betta pairing will require at least a 20 gallon long tank with a 30 gallon increasing the chances of the two species living peacefully. Adding a soft substrate along with lots of plants and structures will also keep your corydoras interested and sheltered while also giving your betta surfaces to rest and explore, which will help keep these two worlds separate.

With the right setup, GloFish cories and male or female bettas can live peacefully together in the same tank.

Why These Others Do Not Work

But what if corydoras aren’t your first choice for a GloFish-betta tank setup? Like any other fish pairing, there are reasons why some species get along and others don’t.

While it is tempting to try adding one of the species below, there are many reasons why these tank mates are less common or just won’t work in the long term.

Pristella Tetras

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GloFish tetras are a modification of the pristella tetra (Pristella maxillaris). These are big, middle-water-column swimming fish that are active and come in a lot of bright colors. Right off the bat, all three of these considerations are reasons why these GloFish tetras are not compatible tank mates.

As mentioned before, bettas live in the upper portions of the aquarium. Though not active swimmers, they like to have a wide array of surfaces available for resting, when they want it. GloFish are active loose schooling fish that will happily spread out across the middle and upper layers of the water column, leaving a betta fish to hide or become overly aggressive. Bettas might also flare at and attack timid GloFish due to their bright colors.

Another important aspect to consider is feeding time. GloFish tetras is hasty feeders that can easily outcompete a slower-swimming betta. Even if you were somehow able to happily house both of these species together, special attention would need to be given to ensure that both fish were getting enough to eat.

Long Fin Tetras

Longfin Tetras

Longfin Tetras are a variety of blackskirt tetra. Available in several colors. Don’t house with nippy fish

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GloFish long fin tetras are another popular option of bright-colored fish, but an even worse option than pristella tetras! These GloFish are altered black skirt tetras (Gymnocorymbus ternetzi). They have long-flowing fins that become a target for both each other and for bettas.

For the most part, long fin tetras have the same behavior as pristella tetras. At first, long fins might even seem more relaxed, but don’t be fooled. These fish are known fin-nippers and will go after each other and slow-moving species. This makes bettas a prime target for harassment. Even if you luck out and get a docile school of GloFish tetras, a betta fish might try to nip at their fins instead.

Danios

Danios

Danios are the original fish that started it all. Great dither fish. Gets along with many fish. Should be housed in at minimum 10 gallons and in a group

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Danios are some of the best beginner fish, but there is little to no compatibility between them and bettas.

GloFish danios are a type of Danio rerio. These fish originate from fast-flowing, coldwater environments where they like to swim against the current at the surface of the water. These water conditions need to be matched in the aquarium setting. That means a lower water temperature, moderate water flow, and plenty of room to zigzag around.

As you can see, these conditions directly contrast those required for bettas. Even if you were able to acclimate GloFish danios to similar water conditions needed by betta fish, there is still a huge difference between activity levels. Simply put, these neon zebra danios require different water parameters and are too active to safely be kept with bettas.

Barbs

Tiger Barb

Tiger barbs are one of the more aggressive fish available. Should kept in groups of 12 to curb aggression. Should not be housed with fish with long fins.

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GloFish barbs are one of the coolest-looking GloFish species due to the contrast created by their black vertical bars. These are tiger barbs (Puntius tetrazona), a long-term favorite in the aquarium hobby. However, these are often misunderstood fish even though they’re one of the top beginner choices.

Tiger barbs were long sold as a community fish. While there are ways to increase the chances of tiger barbs living harmoniously with other peaceful species, like by keeping them in a large tank with plenty of schoolmates, these needs are often not met. This can lead to frenzy-like behavior that confuses and stresses out other fish. They are also notorious fin nippers.

Because of their high potential to be semi-aggressive, GloFish barbs are not compatible tank mates for bettas.

Sharks

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A common tank mate for barbs but not for bettas are sharks. Most often, rainbow sharks (Epalzeorhynchos frenatum) are altered for GloFish gene expression.

These are relatively large fish that can grow up to 6 inches long. They are not schooling fish and only one is safely kept per every 55 gallons.

While GloFish sharks stay at the bottom of the tank like corydoras, they are very territorial and will chase away any fish that tries to stay in the bottom portions of the aquarium. This, in addition to their need for a larger aquarium, makes them impractical to keep with male or female bettas.

Other Fish To Consider

While many of the GloFish species available aren’t compatible with bettas, there are many traditional tropical fish that can fill the space instead.

Neon Tetras

Neon Tetra

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The neon tetra is one of the most popular freshwater fish, period. These are small schooling fish that can comfortably fit in a 10 gallon aquarium alongside a betta fish as long as there are plenty of hiding places.

Chili Rasboras

Chili Rasboras

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

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These are very tiny fish that is bullied by a more assertive betta. Chili rasboras only grow to be about an inch long and prefer to stay toward the upper portions of the water column. If you plan on keeping a school of rasboras with a betta, the betta should be slightly more tolerant of an active fish that swims at the surface.

Ember Tetras

Ember Tetra

A small red tetra that grows up to 1.25 inches. A very peaceful schooling fish

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Ember tetras are similar to neon tetras and should be compatible with most friendly female or male bettas. One benefit to ember tetras is that they’re slightly smaller than neons, which means that you will fit more in a tank.

GloFish Bettas

If you want to skip tank mates altogether, then GloFish bettas have grown in popularity over the past couple of years. GloFish produces these fish, but they only come in a bright neon yellow for right now. They have the same care requirements as regular Betta splendens, but glow in the dark!

Does keeping a GloFish betta mean that you can keep a bigger variety of GloFish species?

Unfortunately, no. GloFish bettas are regular bettas, just with altered genes. They still need special consideration regarding tank size and aggression. However, it is possible to keep a GloFish betta and a school of GloFish corydoras together.
```
Important Note: Glofish Bettas are no longer available at retail stores as Glofish stopped selling the fish. Your best option is to purchase one from a fellow hobbyist.
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Conclusion

GloFish are genetically modified fish that can make good tank mates for betta fish, especially neon corydoras. Like any other fish pairing, tank size, aggression, and overall compatibility still need to be considered whenever trying to keep a different species with bettas., GloFish corydoras are the most successful as they are peaceful, stay at the bottom of the tank, and don’t outcompete bettas during feeding times.
February 11, 2024
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 you’re in search of the smallest goldfish for your compact tank, you’ve come to the right place. This article lists the top breeds that don’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

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- 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 it’s best if multiple goldfish live together as swimming in groups encourages their activity levels.

2. Bubble Eye

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- 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
- 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

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- 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 don’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
- 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

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- 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

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- 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
- 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
- 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
- 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 you’re looking for something new in your petite aquarium tank setup then the hardy telescope goldfish might be just what you’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
- 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
- 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, it’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.

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 fellows’ 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 Goldfish’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 60°F. 70°F).

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 won’t harm delicate creatures or cause potential dangers within the confines of your pet’s home. It’s important to monitor levels such as pH regularly throughout all stages of maintenance and adjustment – not just during setup!

Tank Size Recommendations

It’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 68° to 74°F. 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 goldfish’s health requires more than just decorations. Offering secure and suitable hiding spots and selecting pleasing décor for the tank can make a world of difference for your little fish.

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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:
- Hillstream Loach
- Brochis Catfish
- Platies
- Dojo Loaches
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:
- Cichlids
- Oscars
- Tiger barbs
- Betta fish
- Jack Dempsey
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.

It’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 don’t get very big in general.
February 4, 2024
Fish In Cycling: The Emergency Guide I’ve Walked Countless Customers Through
Over the years, I’ve had countless customers reach out to me in a panic. fish dying, tank cloudy, water parameters all over the place. Most of the time, they’d skipped cycling or didn’t even know what it was. Fish-in cycling is the method you use when there’s no other choice and livestock is already in the tank. It’s not ideal, but it’s survivable if you know what you’re doing. Here’s exactly what I walk people through when they find themselves in this situation.
Key Takeaways
- Adding fish to a new aquarium is never recommended, but you should know what to do in case it happens to you.
- Fish-in cycles are dangerous due to ammonia, nitrite, and nitrate that are left unprocessed because beneficial bacteria aren’t present in the aquarium yet.
- Regularly testing water parameters, daily water changes, limited feedings, adding fish slowly, adding plants, and dosing bacteria can all help in reducing the negative effects of a fish-in cycle.
The Aquarium Cycle

The aquarium nitrogen cycle is a complicated process in which bacteria grow and populate an aquatic system to sustain life. Bacteria take toxic ammonia and nitrite levels and convert them into safer nitrates. Cycling an aquarium without fish can take up to 6 weeks, but is usually finished between 2 to 4.

The main reason why hobbyists wait to add fish until after the nitrogen cycle is because fish create a large amount of ammonia through waste and respiration. This becomes a problem as the population of bacteria in a new aquarium can’t keep up with the demand. As a result, ammonia levels spike, followed by nitrite levels, and eventually nitrates. This can lead to water parameters literally off the charts!

Even when an aquarium is freshly cycled, most hobbyists wait several weeks or months for the tank to reach stability, only adding a couple of fish here and there. This ensures that the bacteria populations grow alongside the increasing influx of ammonia.

Reasons Why It Isn’t the Best Practice

While fish-in cycling is generally looked down upon in the aquarium hobby, it can sometimes be an honest mistake. Unfortunately, many new hobbyists are eager to start their tanks and rely on only one source of information or don’t do any research at all!

If the only source of information is an employee at a local pet store, then the information might be incorrect or outdated. This is especially true if the employee works based on commission, where they are especially eager to sell the new hobbyists as much as they can, including a bag full of fish. Lack of research can also lead to impulsive buys and sudden fish deaths.

Are there any benefits to fish-in cycling?

No, there aren’t any benefits to fish-in cycling. An aquarium can only complete the nitrogen cycle with time and other methods won’t make a bacteria population grow any faster.

If you’ve already started fish-in cycling though, then you’ll want to be prepared for the next steps.

How To Successfully Pull Off Fish In Cycling (In 7 Steps)

Remember, it’s not recommended to do fish-in cycling for your aquarium, but it’s best to be prepared if you find yourself in this situation.

Here is how to handle an uncycled tank safely that already has fish in it!

1. Test Water Parameters

The most important aspect of any aquarium cycling is testing water parameters, even more so for fish-in cycling as fish can easily be affected by unsuitable conditions. In a fishless cycle, water parameters can largely be left uncontrolled, but fish need stability and nontoxic conditions.

While there are no acceptable ammonia and nitrite levels for fish, it’s best to keep both under 1.0 ppm to keep fish safe; this should be enough to keep the nitrogen cycle going while making more tolerable conditions for your fish.

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Along with ammonia and nitrite, nitrate levels should also be tested daily. Nitrate might take longer to appear in the aquarium as it’s one of the last compounds created by the nitrogen cycle. In general, nitrate levels can reach moderately high levels before they become toxic to fish, but a water change will be needed to reduce levels once past 20.0 to 40.0 ppm.

Another crucial water parameter to test is pH. Water’s pH can be difficult to control, and it’s usually best to leave it untouched. However, if your tank is experiencing daily swings of 0.5 to 1.0, then some moderation will be needed.

2. Water Changes

More than likely, you will need to do many water changes between the time of the first fish being added and several weeks after the cycle has officially finished. Water changes are the best way of having an immediate effect on water parameters, so long as the source water is reliable.

Depending on what your testing kit reads, you may need to do water changes once or twice a day until the parameters stabilize. How often a water change is needed will depend mostly on ammonia and nitrite levels, but nitrate can also become deadly at high levels and under extended exposure.

If you find your aquarium has nitrite or ammonia levels above 1.0 to 2.0 ppm, then a water change is needed. However, a large water change can also stress out fish and disrupt beneficial bacteria even more than they already are. Because of this, it’s recommended to do smaller, more consistent water changes.

In general, one or two 25% water changes throughout the day will help keep levels manageable, though this will be different with every fish tank. If ammonia, nitrite, or nitrate levels skyrocket, then it may be necessary to complete a near-100% water change.

Keep in mind that bacteria mostly colonize filter media and don’t live in the water column, so replacing the water is safe as long as the source water is safe.

3. Source Water

Understanding your source water is important for all stages of your fish tank’s life. Whether you decide to use tap water, distilled water, RO water, or RO/DI water, you should always know its baseline parameters.

Unfortunately, many tap water options contain ammonia as a byproduct of chloramine treatment. Products like Seachem Prime can help detoxify harmful compounds. Increasing or lowering pH may also be necessary depending on the origin of the tap water.

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4. Add Fish Slowly

The worst thing you can do for any new tank is add too many fish too quickly. Adding a lot of fish at once causes ammonia spikes due to the additional bioload and the bacteria’s inability to process increased amounts.

⚠️ The #1 Killer: In my experience helping customers through this, overstocking is the thing that turns a manageable fish-in cycle into a full wipeout. Too many fish means too much ammonia, and beneficial bacteria simply can’t multiply fast enough to keep up. If you’re stuck cycling with fish, fewer fish in the tank dramatically increases your chances of pulling it off. If that means temporarily rehoming some fish, it’s worth it. you can add them back once the cycle is established.

Adding a few hardy fish that can withstand less than ideal aquarium conditions is also a good way to give your tank a better chance of surviving its first few weeks. If able, add new fish the second day after the tank is set up. This will allow for some parameters, like water temperature, to stabilize. Even then, it is likely you will lose a few fish.

If you’ve already added all the fish you’re ever going to get into a brand new, day-one, uncycled tank, then you will want to test water parameters daily–if not several times a day–and follow the other protocols on this list.

5. Feeding

Another way to make the cycling process safer is by limiting feeding. During this time, fish will naturally be stressed and won’t need to eat as often as they usually do. Limiting the amount and frequency of feeding also has a few other benefits to keeping toxic levels down.

In any established tank, overfeeding can cause ammonia or nitrite to spike. This is because uneaten food breaks down like any other organic in the aquarium, causing it to contribute to ammonia, nitrite, and nitrate levels. This is also why leftover food should be removed from the tank within 5 minutes of being offered. To help prevent overfeeding and increasing waste load, only a flake or two should be offered at any given time.

Even though your fish might ask you for food, most aquarium species are hardy fish that can easily go several days without feeding. For an uncycled aquarium, it’s recommended to only feed one small portion every other day. This will also naturally decrease the amount of waste entering the system as less fish food is being processed.

6. Add Plants

Aquatic plants benefit any freshwater system, but they’re especially helpful when trying to keep toxic compounds out of an uncycled tank. The main reasons for having a planted tank include processing waste, increasing oxygen levels, and introducing pre-established beneficial bacteria colonies.

In order to grow, plants process nutrients from the water column and the substrate. These essential nutrients just so happen to be nitrate and some parts of ammonia and nitrite. Plants can be used to decrease the impact of ammonia buildup, though how much will depend on how many plants are added. There are also some plants that are more suited for nutrient reduction, such as Azolla, Hornwort, and Watersprite

A planted aquarium will also have more available oxygen than one without plants. In addition to nutrients, live plants also require carbon dioxide to complete photosynthesis. Oxygen is a byproduct of this process and is introduced into the water column. Additional oxygen is crucial for fish experiencing ammonia or nitrite poisoning as those compounds can start to burn the gills and affect breathing ability.

Lastly, adding plants will help transfer some beneficial bacteria from one cycled aquarium to an uncycled one via plants. Many bacteria will be lost in the transfer, but some should be able to be established in the new uncycled tank. This should help increase beneficial bacterial growth and population.

7. Add Beneficial Bacteria

Bottled beneficial bacteria is a relatively new product available at most local fish stores. Often, these products are advertised as being able to instantly cycle an aquarium, making conditions safe for the immediate addition of fish. While bottled bacteria should help introduce bacteria into the aquarium, it doesn’t guarantee that they’ll actually grow.

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The idea behind bottled beneficial bacteria is that you’re instantly introducing a colony of bacteria that can process fish waste and other contaminants¹. This doesn’t mean that you’re skipping the nitrogen cycle, but rather that you’re facilitating the bacterial growth necessary to complete it.

For some tanks, this works. But for others, it’s a false promise. While it won’t hurt your aquarium to dose beneficial bacteria during the cycling process, continue to follow the other recommendations on this list for extra security.

🏆 Mark’s Take: When customers call me in a panic about an uncycled tank, my three-part answer is always the same: dose a quality bottled bacteria product, stay on top of daily water changes to knock back ammonia, and reduce your fish load if you can. Those three things together give you the best shot at getting through this without losing fish. Don’t try to ride it out with just one of the three. you need all of them working together.

Other Tips And Tricks

The best way to safely make it through having fish in an uncycled tank is by monitoring it and making changes gradually. Remember that making big changes on top of already stressful conditions will only make things worse.

A few tips to getting through an uncycled fish tank emergency, on top of the other methods on this list, include: adding filter media from another cycled aquarium and asking your local fish if they’ll hold your fish for you.

As mentioned before, most of the bacteria that live in an aquarium grow within the filter cartridge and media. The easiest way to introduce, and sometimes even complete aquarium cycling, is by transplanting media from an already-established tank to the new one.

Some hobbyists also transfer ‘aquarium gunk’, which is the sludge-like organic matter often at the bottom of the tank or filter, which is teeming with biodiversity and bacteria. This transfer will effectively allow beneficial bacteria to continue processing the new tank just as it was in the previous one.

If everything on this list fails and your new fish are gasping for air, then it might not be too late to ask your local fish store or a fellow hobbyist for help. Many aquarium stores are willing to help out their patrons in regards to quarantining a few fish. They may provide a space for fish to stay while the aquarium cycling continues. If not, a fellow hobbyist may also have the means to make accommodations.

FAQS

What does a fish-in cycle mean?

A fish-in cycle means that fish are present in the tank during the initial nitrogen cycle. This is often a fishless process as fish depend on beneficial bacteria to make the aquarium safe; fish produce toxic ammonia, nitrite, and nitrate that need to be processed by bacteria for safe conditions.

Fish-in cycles were once a popular method due to a lack of research and bad information. Information about the aquarium industry and husbandry was difficult to come by, and many store employees were–and still are–uneducated about the true process.

How long should a fish-in cycle take?

A fish-in cycle can take a week but it can also take two months. How long your tank takes to cycle will depend on how quickly your bacteria can grow, which varies from tank to tank.

A fish-in cycle should be fast but as thorough as possible; while you want conditions to be safe as soon as possible, you also want to give your bacteria time to grow and colonize the aquarium for future stability.

In general, a fish-in cycle can become a ‘ghost’ cycle in as little as a week, especially if it is a heavily planted aquarium. A ghost cycle is when the nitrogen cycle is happening in the aquarium, but goes undetected due to ammonia, nitrite, and nitrate being processed faster than can be tested. As mentioned above, plants take up nutrients, decreasing their presence in the tank water. This can make it seem like it’s a fully cycled tank, but the process is still happening.

Can I add fish during cycling?

It is not recommended to add fish during a cycle, but you might find yourself in this scenario. Check water parameters, change water as necessary, add only a few fish at a time or stop entirely, make feeding adjustments, add plants, and dose bottled bacteria.

Which fish are best for cycling?

If you must add fish to a new tank, then it’s best to add extremely hardy species, like danios, guppies, and platys.

Should I do water changes during a fish-in cycle?

Yes! Water changes are the best way to keep parameters in check at any stage of a new tank. Especially in a fish-in cycle, testing water parameters and performing water changes as necessary to keep ammonia, nitrite, and nitrate levels down may just be what keeps your fish alive.

Final Thoughts

It is never recommended to add fish to a completely new tank, but you might not have known or were given bad information. Luckily, there are a few ways to mitigate the harsh effects of ammonia, nitrite, and nitrate created by more fish waste and respiration. Some of these methods include water changes, limited feeding, and dosing bottled bacteria. If all else fails, you may ask your local fish store or a fellow hobbyist to hold your fish while the cycle continues.
January 31, 2024
Why There Are No Fish For 1 Gallon Tanks That You Can Keep
I get asked regularly about stocking 1-gallon tanks, and my answer is always honest: there are no fish that can be kept humanely in a 1-gallon aquarium. After 25 years in this hobby I’ve seen the results of trying. stressed, short-lived fish in inadequate conditions. This guide explains why, and what the actual minimum tank sizes are.

Are you considering buying a 1-gallon fish tank? A compact aquarium is an attractive idea for many fishkeepers, but such a small tank is not a wise choice for a beginner.

Read this article to explore the potential uses for a 1-gallon fish tank and learn why there are no suitable fish for 1 gallon tank setups. Let’s dive in!
Key Takeaways
- A 1 gallon fish tank or bowl is too small to keep live aquarium fish long-term. They may survive, but they will not thrive in such a cramped space.
- It is possible to keep nano fish like bettas in a 1-gallon tank as a temporary solution, although you need to keep a close eye on water parameters and perform frequent water changes. A heavily planted small tank will help you maintain stable water parameters.
- Experienced aquarists may attempt to keep fish in micro aquariums, but there’s no good reason to attempt this with live animals. A 5-gallon tank is the minimum recommended size for a fish tank, although larger tanks in the 15 to the 20-gallon range are better for beginners.
- Live plants are a better choice for a 1 gallon tank, although small snail species and ghost shrimp or neocaridina/ red cherry shrimp can also be kept in small tanks.
Can You Keep Fish in a 1 Gallon Tank?

Before we go into too much detail, let’s start off with the big question. Can fish live in a one-gallon tank? The simple answer is yes, but as you’ll learn, there’s a lot more to this question than a simple yes or no.

The next question we need to ask is, should fish live in a one-gallon tank, and the answer is no, at least not in the long term.

Read on as we explore some of the reasons why such a small tank is just not enough space for pet fish.

The Natural Habitat Debate

Sure, many fish live in very small ponds in nature. Betta fish are known to survive in shallow ditches, and some killifish even complete their entire lifecycles in large rain puddles!

However, even the smallest of these ponds and puddles are much larger than a gallon. Shallow freshwater ecosystems are also usually well-vegetated and complete with organisms that help to maintain water quality. Recreating a functional ecosystem is possible in aquariums but very difficult in a micro setup.

Aquarium Size and Swimming Space

One-gallon fish tanks measure about 8 inches long, 6 inches wide, and about 5 inches tall (20x15x13cm). 1-gallon bowls are more common than tanks, and these typically have a diameter of about 8 inches.

That’s really not a lot of space for a fish to swim, so immediately, you run into potential problems for active swimming fish like zebra danios. It’s also important to note that most small fish live in schools or shoals in nature, so it’s best to keep them in groups of six or more.

Hardware And Decorations

Most fish prefer some sort of cover in their tank, like caves where they can hide or plants where they can shelter. However, your space is already pretty limited in a 1-gallon tank, so everything you add to the tank decreases the space for your fish.

The small size of this tank also makes it difficult to find aquarium equipment like heaters and filters.

Water Quality

Maintaining high water quality and stable water parameters is your number-one goal as a fishkeeper. Water quality tends to decrease over time, and at a certain point, fish become sick and even perish in bad water. Now, even large aquariums need regular maintenance, but things can go bad very quickly in a small tank!

As uneaten food and fish waste collects in a fish tank, ammonia accumulates in the water before being converted into nitrite and then nitrate. Ammonia and nitrite are highly toxic to fish, so without a functioning colony of beneficial bacteria in a properly cycled tank, your pets are likely to get sick.

It is possible to cycle a micro aquarium, but such a small tank would be in a delicate balance and very sensitive to increased nutrient levels and other disturbances.

What Can You Keep in a Small Aquarium?

Many small fish and invertebrates are suitable for small aquariums, although 5 gallons is the smallest you want to go for long-term care.

That being said, many species can survive in a 1-gallon tank, but they are not likely to enjoy the experience! That means a 1-gallon setup is usually only recommended as a temporary solution and not as your pet’s forever home.

Nano Species

Nano fish are small species, usually growing to less than about 2 inches. The smallest nano species in the fish keeping hobby grow to about 0.75 inches or so, but even larger species like the betta fish are often kept in tiny tanks.

Let’s take a look at a few small fish species and discuss whether they are suitable for a small one-gallon tank.
- Betta Fish
The betta, or Siamese fighting fish, is usually the first choice for fish keepers who want a tiny tank, but a 1-gallon tank is simply too small for an adult betta fish. Sure, these popular fish are often sold in tiny tubs or cups in the aquarium trade, but if you look a little closer, those fish don’t look very happy or healthy!

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Betta Fish

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A 5-gallon aquarium with a filter and a heater is a much better long-term solution for betta fish care, and really is the minimum tank size you should consider for these beautiful fish.
- White Cloud Minnows
White cloud mountain minnows are popular cool-water nano fish for smaller tanks. These freshwater aquarium fish max out at about an inch and a half, and their hardy nature makes them a great choice for a beginner.

White Cloud Mountain Minnow

A very peaceful fish that does well in coldwater fish. Other minnow varieties are also available

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However, white clouds are not recommended for tanks smaller than five gallons, and ten gallons is actually their recommended minimum tank size.
- Japanese Rice Fish
Japanese Rice Fish

Japanese rice fish are a commonly overlooked fish suitable for freshwater aquascapes. Very peaceful and hardy fish that color up with companions

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Japanese rice fish, also known as Medaka, are tiny fish that are often kept in small aquariums. Like most other nano fish, they could certainly survive in a tiny one-gallon tank, but it would be very difficult to keep them healthy, and that’s why they’re much better off in a ten-gallon aquarium.
- Neon Tetras
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Neon tetras may be small (up to 1.5 inches), but these stunning schooling fish from South America need a bigger tank than you might think. In fact, 10 gallons is the smallest you’d want to go for these active swimmers, but 15 to 20 gallons is a much better option.
- Least Killifish
The least killifish is a truly tiny creature, and one of the species with the smallest tank requirements in the hobby. Males grow to less than an inch, and females grow a little more than an inch.

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A pair of least killifish can be kept in a tank as small as 3 gallons or so, but again, a larger tank in the 5- 10 gallon range would be better.

Invertebrates

Invertebrates (mollusks, crustaceans, etc.) are a popular choice for a smaller aquarium due to their small size and low bioload. Let’s take a look at some popular inverts that can survive in a smaller tank.
- Snails
Snails are popular freshwater aquarium pets that don’t need a huge tank to thrive. However, a 1-gallon tank is a little too small for some species.

You could attempt a 1-gallon setup for small species like bladder snails, but larger aquariums are necessary for bigger species and assassin snails.
- Shrimp
It is possible to keep shrimp in a 1-gallon size tank, but you run the same water quality risks as when keeping fish. A few ghost shrimp could work in a 1-gallon tank with live plants and careful monitoring, but a larger aquarium is always a better bet.

Live Plants

Live aquarium plants are a great option for a small space, and have the added benefit of stabilizing water parameters, which is great if you do need to keep any invertebrates or fish in the tank temporarily.

Many aquarium plants grow too large for a 1-gallon tank or bowl, so make sure you choose miniature species. The following popular aquarium plants are suitable for a small tank:
- Cryptocoryne parva
- Anubias nana petite
- Java moss or Christmas moss
- Bucephalandra spp.
- Red root floater
What To Do With Them?

The question of keeping fish in a 1-gallon tank mostly centers around ethics. Remember, the simple answer is that a small fish will survive in a 1-gallon tank, and maybe even live a full and healthy life if you’re experienced and dedicated enough to perform frequent water quality maintenance.

However, you should also ask yourself why you’re keeping fish in the first place and whether survival is enough or if you want your pets to be as comfortable as possible. Looking at it from this perspective, there are just a few scenarios where you might consider keeping fish in such a small environment.

Read on to learn when you could keep fish in a one-gallon aquarium and discover alternative options for your tiny tank.

Connect Multiple Aquariums

There is one scenario that would theoretically allow you to keep a few species permanently in 1-gallon aquariums, but this is something only experienced aquarists should attempt.

Without going into too much detail, it is possible to plumb multiple tanks together and use a central sump system to pump water through all of them. Ten one-gallon tanks connected would allow you to keep multiple small tanks with small fish while having a better chance of maintaining good water parameters.

It’s important to remember that each fish will still be confined to its own tank, so this is only a good option for the smallest nanofish and species that do not need much swimming space. You’ll also need excellent filtration to maintain good water quality, and some live plants will also help to stabilize the system.

Possible species for a multiple-tank setup include:
- Nano Boraras species like chili and exclamation point rasboras
- Celestial pearl danios
- Ricefish
- Endler’s livebearers
- Scarlet Badis
- Least Killifish
- Emerald rasbora
Parasites and infections spread easily in this kind of setup, so it’s important to quarantine any fish before adding them to the system. This usually involves keeping new fish in a separate cycled tank for three or four weeks to observe their condition and medicate if necessary.

Temporary Housing

It’s always handy to have a spare tank on hand for emergencies. If a new fish in your community tank turns out to be a bully, or if one of the other fish is getting picked on, you may need to move one to a separate tank while considering your options.

Small tanks are also useful for quarantining or medicating sick fish outside of their regular tank. This is especially useful when using medications that are harmful to other animals in a community tank.

You could also use a tiny tank as a temporary housing solution when remodeling one of your larger tanks, but you’ll need to pay close attention to your water parameters and quality. Overfeeding is one of the biggest dangers when moving your fish to a very small tank because excess nutrients from uneaten food can cause rapid changes in water quality.

It is especially important to understand the nitrogen cycle before attempting to keep anything in a small tank, whether it’s a long-term or just a temporary solution. You’ll also need a reliable test kit to monitor your water parameters and develop a water change schedule.

Growing Live Food

A one-gallon tank might be too small for fish, but this tank size is pretty handy for growing your own fish food. Culturing live food is a great idea for feeding picky fish like the scarlet badis and pea puffer.

You could try breeding bladder snails, daphnia, or even mosquito larvae to provide your fish with a free and healthy food source. Just make sure none of those mosquitos escape! Infusoria is a great starter food for fish fry that you can grow in a small tank.

You can also grow algae on rocks if you keep your tank in a sunny area. This is a great natural food source for algae eaters like the otocinclus catfish and some of the Southeast Asian gobies.

Try A Terrarium

You could also try something completely different with a one-gallon fish tank and convert it into a terrarium. Miniature cacti or other succulent plants look great in small glass enclosures, but almost any small plant could survive with the right soil, nutrients, and light.

You’ll still need to water your plants, but they’ll be much easier to care for than live fish in such a tiny space!

FAQs

What fish can live in a one-gallon tank?

Pretty much any small fish can survive in a 1-gallon tank for as long as you can maintain suitable water quality. However, a one-gallon tank is really too small for the long-term care of any fish species, especially if you care about the welfare of your pets.

Can a betta live in a 1-gallon tank?

Betta fish will survive in a one-gallon fish tank, although they will be very cramped and difficult to care for in the long-term. A five-gallon aquarium is the minimum recommended size for a betta fish tank.

How many guppies can live in a 1-gallon tank?

You could keep a single male guppy in a 1-gallon aquarium, although it would be much better to keep a small group of five or six in a decent 15-gallon tank with filtration and heating.

What is the best fish for a small aquarium?

Each fish keeper has their own favorite small fish species, but I do not recommend keeping any freshwater aquarium fish in a tank size smaller than 5 gallons. This tank size will make a great home for bettas and killifish.

Step up to a 15-gallon aquarium to keep even more fish like small tetras, rasboras, and honey gouramis. At this tank size, you can even keep a small community and observe the interesting behavior of happy schooling fish!

Can 2 goldfish live in a 1-gallon tank?

Goldfish need a surprisingly large aquarium for long-term survival. A pair of adult goldfish requires at least 30 gallons, so a 1-gallon tank or bowl just isn’t going to work!

Can snails live in a 1-gallon tank?

Like all aquatic creatures, snails produce waste that can accumulate and affect water quality. Many aquarium snail species are very hardy, but you’d still need to clean their tank regularly and perform a few water changes each week to keep their water quality high. Small species like bladder snails could be an interesting option for a 1-gallon aquarium.

Final Thoughts

Unfortunately, a one gallon aquarium is just too small for keeping fish. However, there are a few things you can do with such a small tank, so don’t be too quick to put your tiny aquarium up for sale! Micro setups are great for growing plants, growing live food, or housing fish for short periods in emergencies.

Do you have a one-gallon aquarium? Let us know what you keep in your tiny tank!
January 25, 2024