Tag: Fishkeeping

Iridescent Shark: An Honest Care Guide (And Why Most Aquarists Shouldn’t Buy One)

The Iridescent Shark is the kind of fish that makes experienced keepers stop and stare. This is not a beginner species. It requires specific conditions, a specific tank, and a keeper who understands what they are signing up for. After 25 years in the hobby, I still consider this one of the most fascinating fish you can own.

This fish will outgrow your plans. Accept that before you buy it.

ASD Difficulty Rating: Expert — Requires 300+ gallon (1,136+ liter) tank for adult colony; schooling fish needs group of 3+; extremely skittish (panic can injure or kill tank mates); 15–20 year commitment; fast growth catches new owners off guard.

This fish lives a long time, grows large, and demands a dedicated setup. The commitment is real and the costs add up over years, not months.

Oddball fish are not conversation starters. They are conversation dominators. Guests will stare at this tank for twenty minutes.

What It Is Actually Like Living With Iridescent Shark

Oddball fish are the fish that visitors notice first. Nobody glances at this tank and keeps walking. They stop, stare, and ask questions. Be prepared to explain what you are keeping multiple times a week.

Feeding is an event. Many oddballs are predators that hunt live or frozen food with visible intensity. Watching this fish track and strike at prey is one of the most dramatic moments in fishkeeping.

These fish grow fast and steadily. One month it fits comfortably. Three months later, you are researching larger tanks. The growth rate catches new owners off guard every single time.

Oddball fish often recognize their owners. They approach the glass when you enter the room, accept food from your hand, and display behaviors that feel remarkably personal. That connection is why oddball keepers rarely go back to community tanks.

What Most Care Guides Get Wrong About Iridescent Shark

The biggest misconception about Iridescent Sharks is that the 3-inch juvenile in the store is what you are buying. It isn’t. These fish reach 3 to 4 feet in the wild and 18 to 24 inches regularly in captivity, in groups of three or more. In my 25 plus years in the hobby, I’ve watched more iridescent sharks get donated to public aquariums – or worse, released – than almost any other large fish in the hobby. The minimum tank for a group of adults is 300 gallons. A 75-gallon is not a long-term home. It’s a holding tank.

Hard Rule: Do not buy iridescent sharks unless you have a 300-gallon (1,136-liter) tank available now or within 12–18 months. The 3-inch (7.6 cm) fish at the store becomes an 18–24 inch (45–61 cm) fish that needs to school with others. There is no middle ground on tank size.

The Reality of Keeping Iridescent Shark

Tank size requirements are extreme. Most oddball fish grow large, fast, and need significantly more space than beginners expect. A 2-inch juvenile will eventually need hundreds of gallons. Research adult size before purchasing, not juvenile size.

Diet is specialized. Many oddball fish are predators that need live or frozen foods. Some refuse pellets entirely. Feeding costs for large predatory fish add up quickly over the life of the fish.

Tankmate compatibility is extremely limited. Most oddball fish are either predators that eat smaller fish or territorial species that attack anything in their space. Community setups require careful size matching.

Biggest Mistake New Owners Make

Buying a juvenile oddball fish without understanding its adult size. That cute 3-inch fish at the store will be 18 inches long within two years and need a tank most people cannot afford or fit in their home.

Expert Take

Before you buy any oddball fish, look up its adult size and multiply your expected tank cost by three. That is the realistic budget for keeping this fish properly.

Key Takeaways

Iridescent sharks require proper tank setup, water parameters, and balanced diet to maintain health.
When selecting tank mates for iridescent sharks choose larger peaceful aquarim fish like silver dollars and tinfoil barbs.
Monitor water quality and exercise caution when approaching the tank as they is startled easily.
The Reality of Keeping Iridescent Shark
What It Is Actually Like Living With Iridescent Shark

Species Overview

Scientific Name	Pangasius hypophthalmus
Common Names	Iridescent Shark, Sutchi Catfish, ID Shark, Sutchi Catfish
Family	Pangasiidae
Origin	Mekong River Basin in Southeast Asia
Diet	Omnivore
Care Level	Advanced
Activity	Active
Life span	15 – 20 years
Temperament	Peaceful (Will eat smaller fish)
Tank Level	All
Minimum Tank Size	300 gallons
Water Temperature Range	72°F to 79°F (22°C to 26°C)
Water Hardness	2-20 dKH
pH Range	6.5 – 7.5
Filtration/Water Flow	High
Water Type	Freshwater
Breeding	Mostly commerciality
Difficulty to Breed	Difficult
Compatibility	Similar sized fish only
OK, for Planted Tanks?	No

Introduction

Want a conversation piece? Get this fish. Want easy maintenance? Get community fish instead. There is no middle ground with oddball species.

The iridescent shark, otherwise known as the sutchi catfish or siamese shark (pangasianodon hypophthalmus) is a species of scaleless freshwater fish native to Southeast Asia’s Mekong and Chao Phraya river basins. It can grow up to an impressive 52 inches in length with weights over 40 kg, being one of the largest fish available in the aquarium trade.

Despite its alluring appearance that attracts aquarists from around the world, most home tanks are simply too small for this animal, making it difficult for them to live their full lifespan in captivity due to inadequate space and care needed. Only experienced owners with large tanks should consider adding one of these sharks into their aquariums

Natural Habitat And Distribution

Iridescent sharks (also known as iridescent catfish) are found in the depths of Southeast Asia – specifically, Mekong and Chao Phraya rivers. Due to loss of habitat, contamination, as well as overfishing, these creatures now find themselves classified on the IUCN Red List’s endangered species list. Despite this tough situation they encounter out in nature, iridescent sharks remain popular in aquariums across the world today.

Researchers and officials from the Wonders of the Mekong said that the Cambodia’s Upper Mekong River system is likely the last surviving natural habitat for the endangered Pangasianodon hypophthalmus or iridescent shark.

Fishbio Report

Their skill for getting around their natural environment even when it is difficult to see relies upon long barbels that produce sensory data, which helps them get by successfully during darker periods. The way they reproduce ties into their home surroundings considerably. Something we look into later throughout our guide.

Appearance

The iridescent shark is a captivating species, starting off its life with skin shimmering with an entrancing rainbow of colors that darken to solid grey as they age. Its defining features are the sail shaped dorsal fin and other fins, which become darker in shade. Juveniles will have a black stripe along their lateral line and a second stripe below it. It also has two pairs of barbels attached to their face along with large eyes and forked caudal fin.

A rare variant appears among these sharks. The albino iridescent sharks – completely white in coloration except for bright red eyes, making them highly sought out by aquarists wishing for something different from common aquarium dwellers. The albino iridescent shark care requirements remain unchanged when compared to regular non-albino counterparts, so make sure you’re ready before getting one!

All the same characteristics give this unique creature great visual appeal. Regardless of whether it’s normal or not, certain shades may set apart some members more than others, like those striking albino versions.

Size And Growth

Iridescent sharks can reach up to a formidable 52 inches in length and weigh over 40 kg. They grow at an accelerated rate, quickly reaching adult size in just two or three years’ time. Consequently, these large fish need spacious tanks for their optimum welfare and comfort. I have see them outgrow their tanks in less than 4-5 month often times eating smaller fish on the way.

⚠️ The “Trap Fish” Warning: Iridescent sharks are sold as cute 2. 3 inch juveniles in pet stores, but they grow to over 52 inches and can weigh more than 40 lbs. I consider them a classic trap fish. They’re impulse buys that people take home without understanding what they’re signing up for. Most outgrow their tank within a year or two, and rehoming a 4-foot catfish is genuinely difficult. Unless you already have a 300+ gallon setup or a large pond, I’d recommend skipping this fish entirely and choosing something more appropriately sized.

Not many aquarists are able to accommodate such sizable creatures when they become adults! Unfortunately, some people buy juvenile iridescent sharks without realizing the space that they will eventually require as adults. Something which often leads to cramped living conditions filled with stress, which can take its toll on the health of the shark catfish, adversely affecting lifespan expectancy.

It is critical for prospective owners of this species to plan ahead before bringing one home so that you know what level of care (especially concerning adequate housing space) must be offered throughout their entire lifetime; otherwise, rehoming may prove challenging down the line if circumstances change unexpectedly later on.

Caring for Your Iridescent Shark

Caring for iridescent sharks requires a spacious, healthy tank with suitable water parameters and an appropriate environment to ensure their wellbeing. When selecting compatible tank mates it is also important to provide them with a balanced diet. In order to give your shark the best care possible these are some of the specifics you should be aware of:

Tank size and setup must meet specific guidelines;
Water filtration needs constant monitoring as well as careful management when maintaining certain conditions;
Feeding recommendations focus on delivering essential nutrients that improve overall health while avoiding overfeeding or malnutrition dangers;

We’ll go over each point in the sections below.

Tank Size And Setup

When it comes to keeping iridescent sharks, a minimum tank size of 300 gallons is a must. For each additional shark, an extra 150 gallons should be provided for optimum comfort and safety. Undersized tanks can lead to harm or stress for the fish. Often fish in undersized tanks will also exhibit aggression.

🐟 Mark’s Honest Take: I’ve never kept an iridescent shark. And that’s a deliberate choice. A 300-gallon tank is roughly 8 feet long. That’s not a home aquarium for most people; that’s a commercial-level setup or a serious enthusiast’s pond. I’ve seen stores sell 2-inch juveniles with no context about what they become, and it’s one of the most common mismatches in the hobby. If you’re committed to this fish, make sure your infrastructure is already in place before you buy. Not after.

To recreate their natural environment inside your tank use soft substrate like sand or consider a bare bottom setup. These fish are too large for any type of planted tank setup, so consider leaving them out.

Also, avoid decorations that may injure these animals. These fish are scaleless and are prone to injuries from running into large or sharp objects.

Water Parameters And Filtration

While these fish are big and hardy, they still need the proper parameters so they can thrive. Temperature should be kept between 72 to 79°F (22 to 26°C), while the ideal pH level is in a range from 6.5 and 7.5 with general hardness ranging 2-20dGH. Unfortunately, since they require at least room temperature water, they do not do well in outdoor ponds as they will get cooler than that.

Since these species produce hefty amounts of waste, it’s important for efficient filtration processes to occur regularly. 25% per week through a electric pump or vacuuming system works best at maintaining good quality standards in the aquatic environment which they inhabit.

This becomes especially important because you have no means of natural denitrification processes without plants so water changes are your best bet.

Feeding

It is important to maintain a healthy diet for iridescent sharks, as they need variety. This should include their staple food source of high-quality pellets and occasional supplements of live or frozen organisms such as worms, crickets and feeder fish in order to ensure proper nutrition. As the shark grows older, incorporating vegetable matter into its meals will also be beneficial. Thus it’s recommended that you offer them these fresh foods every two or three days on top of their regular pellet intake so they can remain lively and vibrant within your home aquarium environment!

Behavior And Socialization

Iridescent sharks are peaceful and social, living in groups. While they aren’t aggressive by nature, their size can make smaller fish feel intimidated. It is important to choose appropriate tank mates for them so that stress levels remain low. As these fish get larger, they will happily eat any fish that can fit in their mouths making it difficult to house many traditional tropical fish with it.

Tank Mates

When it comes to choosing suitable Iridescent Shark tank mates for iridescent sharks, active fish such as:

Aggressive fish like freshwater stingrays or large predatory cichlids like Oscars and peacock bass should also be considered due to their peaceful nature that won’t be easily intimidated by the size of an iridescent shark.

It is important to monitor interactions between your iridescent shark and any new additions you may want in the aquarium, particularly those that will harm them from being too aggressive or small compared its own size. Remember that every fish is different and the temperament listed on our post is different than the fish you actually own.

Startle Response And Precautions

Iridescent sharks, due to their lack of sight and heightened sensitivity to noise and sudden movements, have a tendency towards startle reactions that can result in them inadvertently crashing into tank walls or equipment. To keep your fish calm, it is best to create an environment with little sound by placing the aquarium away from bustling areas of your home and approaching any interaction slowly so they are not disturbed. Below is an example of these fish jumping out of their tanks (video source).

It is not uncommon for these fish to jump out of their tanks when startled. Given their size, they are hard to handle when they do jump out and will often damage lights and covers when they attempt.

Health Concerns And Disease Prevention

Want a conversation piece? Get this fish. Want easy maintenance? Get community fish instead. There is no middle ground with oddball species.

Keeping water quality up is essential for the well being and long life of iridescent sharks. They are at risk for things like fungal infections on their skin as well as “ich,” a protozoan parasite, which is caused by poor water conditions, leading to stress and weakened immunity in the fish. Another challenge with these fish is that they are scaleless, they are certain medications that cannot be treated much like clown loaches.

Monitoring your tank’s water parameters closely should help you identify any signs of illness early so that appropriate treatment options is accessed from either your local fish store or veterinarian. These fish are one of the rare fish that are large enough that a vet may be willing to see them.

Breeding Challenges And Considerations

It is an ambitious project to try and breed iridescent sharks in captivity as they are migratory fish that need specific environmental requirements, along with a vast amount of space. In their natural habitat these schooling species count on seasonal changes together with movement patterns for breeding purposes, something difficult to reproduce at home.

Although the chance of successfully breeding this type of shark in your aquarium is slim, it’s still necessary you give them proper care nonetheless. Considering how awe-inspiring they look plus all its distinctive features, having one or more around will make any tank truly special regardless of whether there are plans for reproduction or not.

Frequently Asked Questions

How big can iridescent sharks grow?

Iridescent sharks, which are quite sizable aquatic creatures, can measure up to 52 inches and weigh more than 40 kgs. These large fish make a definite statement in any environment they inhabit. They will eat any fish they can fit in their mouths!

What is the minimum tank size for iridescent sharks?

It’s best to have a 300 gallon aquarium for iridescent sharks. For some, an indoor pond is best suited for them.

What do iridescent sharks eat?

Iridescent sharks are omnivorous, needing a diet composed of top-notch pellets, both frozen and live foods, along with vegetables to remain in good shape. As they get larger, earthworms, mussels, crayfish, and whole shrimp are some great foods to feed.

Are iridescent sharks aggressive?

Iridescent sharks are non-threatening animals, with peaceful and social natures. However, they will eat anything that can fit in their mouths including other fish.

Why is breeding iridescent sharks in captivity difficult?

It is tricky to cultivate iridescent sharks in captivity due to their nomadic behavior and need for very precise environmental variables as well as ample living quarters.

Is the Iridescent Shark Right for You?

Good Fit If:

You already have or are actively building a 300-gallon (1,136-liter) or larger setup
You want a visually dramatic schooling species that recognizes you and reacts to your presence
You are prepared for a 15–20 year commitment and the feeding and filtration costs of multiple large catfish

Avoid If:

Your tank is under 300 gallons – even 200-gallon buyers end up rehoming these within two years
You keep small fish – iridescent sharks eat anything that fits in their mouth
You want a peaceful community tank – panic responses from iridescent sharks can injure or kill other fish
You cannot commit to the long-term cost and space requirements of growing multiple large predator catfish

Closing Thoughts

The iridescent shark is one of the most impulse-bought, undersized-tank fish in the hobby. The 3-inch juvenile becomes an 18-inch schooling fish. Plan for that before you buy. If you have the tank – 300+ gallons, a group of three, heavy filtration, open swimming space – this is a genuinely impressive fish that will define the room it’s in. If you don’t, this is the one to admire at the public aquarium and leave there.

📘 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.

October 20, 2023

10 Types of Fish Tanks: How to Choose the Right Setup for Your Budget

Expert Take | Mark Valderrama — AquariumStoreDepot

I have kept almost every type of tank on this list at some point over 25 years in the hobby. My most rewarding build was a 125-gallon reef that took years of patience and a few expensive crashes. I have also run simple 20-gallon community setups that practically managed themselves. The biggest mistake I see beginners make is choosing a tank type based on what looks impressive rather than what fits their budget, schedule, and experience. Get that decision right first and everything else follows. Get it wrong and you will spend more money fixing problems than you would have spent just setting it up correctly from the start.

My most rewarding tank setup was my 125-gallon reef. It took years to build and it was worth every bit of it. But I have also kept a 65-gallon community freshwater, bettas, and plenty of other setups over the years. The type of tank you choose sets the direction for everything else: your fish choices, your equipment, your budget, your maintenance routine. Getting this decision right from the start makes a real difference. Here is how I would break it all down.

Your tank type determines your entire hobby experience. Choose based on what you can actually sustain, not what looks great in someone else’s video.

Key Takeaways

All-in-one aquariums are ideal for beginners, but careful cleaning is necessary for tanks made of acrylic
A freshwater tropical community tank is the best starting point for most new fish keepers, with the widest species selection and the most forgiving water chemistry
Basic saltwater aquariums are achievable for beginners, but reef tanks with live corals require significantly more equipment, expense, and experience
Every tank needs a quality filtration system, appropriate heating for tropical species, and a cycled nitrogen cycle before adding fish
Bigger tanks are more stable and forgiving than smaller ones; for freshwater beginners, start at 20 gallons (76 L) minimum

Tank Type Difficulty Tiers

Beginner Territory

Freshwater tropical community, cold water (goldfish/koi), brackish. Forgiving water chemistry, wide species availability, lower equipment cost. A good 20 to 55-gallon (76 to 208 L) setup with a reliable filter and heater is all you need to start.

Intermediate

Planted aquarium (low to medium tech), African cichlid, freshwater aggressive (one species setups). Each has one non-negotiable requirement: CO2 or fertilizers for planted tanks, alkaline hard water for African cichlids, tankmate research for aggressive species. Get that one thing right and you are fine.

Advanced

Saltwater FOWLR, high-tech planted (Dutch or Iwagumi), paludarium. Saltwater requires a protein skimmer, live rock, and patience with the nitrogen cycle. High-tech planted tanks need CO2 injection, precision lighting, and weekly dosing. Both reward the investment but punish shortcuts.

Expert

Reef tanks with live coral. This is a different hobby within the hobby. Parameters that hobbyists never think about in freshwater (alkalinity, calcium, magnesium) matter constantly. Budget $1,500 to $5,000 minimum for a reef setup that has a real chance of success. I am not trying to scare you off. I am trying to make sure you know what you are signing up for before the coral dies.

Top 10 Types Of Fish Tanks

In this section, I will cover the ten main aquarium types, what each one involves, and who it is actually suited for. Check out our YouTube Channel for video content on many of these setups.

Mark’s Sizing Rule: Match your budget to the tank, not the other way around. I have seen plenty of people push for a 75-gallon because it sounds impressive, then cut corners on filtration, lighting, or livestock because the money ran out. A well-equipped 40-gallon (151 L) is a better experience every time. For freshwater beginners, I recommend starting at 20 gallons (76 L). It is forgiving and affordable to set up right. For saltwater, aim for at least 40 gallons (151 L) for stability, and push to 75 gallons (284 L) if your budget genuinely allows it.

1. Cold Water Aquarium

A cold water aquarium houses fish that thrive without a heater, including goldfish and other temperate species. Unlike tropical setups, cold water tanks run at room temperature, which simplifies equipment needs. The tradeoff is that goldfish are heavy waste producers and need substantial filtration and tank volume. Common goldfish grow to 12 inches (30 cm) or more in the right conditions, so a 40-gallon (151 L) minimum per fish is not an exaggeration.

Stocking options:

Goldfish
Koi (indoor and outdoor ponds)
Japanese ricefish
White cloud mountain minnows
Axolotl

2. Brackish

Brackish fish live in coastal environments where freshwater rivers mix with salt water from the ocean. Most brackish species are tropical and need stable, warm temperatures. You will need to prepare their water with reef salt and maintain a specific gravity between 1.005 and 1.012, monitored with a refractometer. It is one extra step compared to freshwater but far less demanding than a full marine setup.

Stocking options:

Scats
Monos
Bumblebee goby
Brackish puffer fish species
Archer fish

3. Tropical Community Setup

The tropical community setup is the most popular starting point in the aquarium hobby for good reason. It gives you access to hundreds of species, forgiving water chemistry parameters, and a wide range of affordable, compatible fish. The key discipline is research before purchase. Some species prefer different temperature ranges or pH, and some simply do not tolerate being housed together. A 20 to 55-gallon (76 to 208 L) tank with a reliable heater and filter is all you need to build a stunning display.

Stocking options:

Schooling fish like tetras, corydoras, and rasboras
Bottom dwellers and schooling fish
Invertebrates like snails and shrimp

4. Freshwater Aggressive

Big, aggressive freshwater fish are genuinely impressive to keep, and many of them become highly interactive pets. The discipline is tank mate selection. These fish are often species-only setups or require very careful research to build a mixed aggressive display. For beginners, start with one aggressive species in its own tank before attempting any mixed aggressive community.

Stocking options:

Oscar
Red devil cichlid
Siamese fighting fish/betta (solo tank)
Mbu pufferfish

5. African Cichlid Tank

African cichlids are some of the most colorful and fascinating freshwater fish available. Most popular aquarium species come from Lakes Malawi and Tanganyika. These fish are highly territorial and need hard, alkaline water, which is the opposite of most tropical community setups. Do not mix African cichlids with soft-water South American species. Get the chemistry right for your lake of choice, stock densely to spread aggression, and add plenty of rockwork. Done correctly, this tank type produces the most visually dramatic freshwater displays in the hobby.

Stocking options:

Mbunas (rock-dwelling Lake Malawi cichlids)
Peacock cichlids
Haps (Lake Malawi open-water species)

6. Planted Aquarium

A planted tank is one of the most rewarding setups you can build once you understand the basics. Live plants improve water quality, reduce nitrates, and create a natural environment that reduces fish stress. You can start simple with low-light plants like java fern and anubias in a standard community tank, or go deep into high-tech aquascaping with CO2 injection, specialized substrate, and precision lighting. The entry cost for a low-tech planted tank is minimal. The cost for a competition-grade aquascape is substantial.

Stocking options:

Cold water or tropical community species
Shrimp and nano fish for planted aquascapes
Any species compatible with the water parameters the plants prefer

7. Paludarium

A paludarium combines aquatic and terrestrial environments in the same enclosure, typically mimicking a river bank, swamp, or jungle waterway. They are more complex to build and maintain than standard aquariums but offer a uniquely dramatic display. If you enjoy building as much as keeping, a paludarium is a genuinely fun project. Plan the drainage and water return system carefully before building, because fixing it after setup is a major headache.

Stocking options:

Nano fish in the water section
Various aquatic and terrestrial plants
Frogs
Turtles

8. Saltwater Fish-Only (FOWLR)

A fish-only-with-live-rock (FOWLR) saltwater tank is the most accessible entry point into the marine side of the hobby. You keep saltwater fish with live rock for biological filtration, but no coral. This cuts out the most expensive and demanding part of reef keeping while still giving you access to spectacular marine species like tangs, angelfish, and lionfish. Budget for a protein skimmer, quality live rock, and proper salinity management. A FOWLR done well is a genuinely achievable project for a dedicated intermediate hobbyist.

Stocking options:

Most marine fish species (tangs, angelfish, clownfish, wrasses)
Hardy marine invertebrates that are not eaten by fish

9. Reef Tank

A reef tank recreates the habitat of a tropical coral reef in your home. This is the most demanding and most rewarding tank type in the hobby. You are not just keeping fish. You are maintaining a living ecosystem with corals, invertebrates, and precisely controlled water chemistry. Alkalinity, calcium, and magnesium all need monitoring. Lighting is expensive. Livestock is expensive. The mistakes are expensive. My 125-gallon reef was the best tank I ever built and also the most humbling. Do not start with reef until you have run a successful saltwater or freshwater system for at least a year.

Stocking options:

Many colorful reef-safe fish species
Live corals (soft, LPS, SPS depending on lighting and flow)
Anemones, starfish, shrimp, snails, and other invertebrates

10. Saltwater Predators

Not all saltwater fish are docile reef residents. Marine predator tanks are built around species like lionfish, moray eels, groupers, and large puffers. These fish make incredible display animals with big personalities. The tradeoff is that most will destroy invertebrates and eat smaller fish, so tank mates need to be chosen very carefully. A 100-gallon (378 L) or larger is typically required to house these animals responsibly.

Stocking options:

Moray eels
Grouper
Lionfish
Marine pufferfish

7 Types Of Aquariums You Can Buy

Once you choose your tank type, the next decision is the physical aquarium itself. Here is what you need to know about each style before spending money.

1. Nano Tanks

Nano aquariums run from about 2 to 20 gallons (8 to 76 L). Affordable and compact, but not necessarily easier to maintain. Smaller water volume means faster parameter swings and less room for error. A 5-gallon (19 L) is the minimum for any fish. A 15 to 20-gallon (57 to 76 L) nano allows a real schooling setup and is a much better experience for beginners than the smallest tanks.

2. All-In-One Aquariums

Waterbox Nano

A classy rimless nano reef tank that won’t break the bank. Great design with a well designed all in one chamber.

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All-in-one setups include built-in filtration chambers and, in many cases, built-in stands and cabinetry. They remove the guesswork of equipment selection for beginners and tend to be the cleanest-looking option aesthetically. Available in sizes from nano to large display tanks. The best ones are genuinely excellent setups; the cheapest ones cut corners on filtration capacity, so buy from a reputable brand.

3. Reef-Ready Aquariums

Reef-ready tanks come pre-drilled for overflow and sump setups, which is mandatory for any serious saltwater or reef system. Drilling glass after the fact is expensive and risky. If you plan to build a reef or a serious FOWLR system, start with a reef-ready tank and save yourself the hassle. These tanks are designed to handle sump-based filtration, which is the gold standard for saltwater systems.

4. Glass vs. Acrylic

Glass tanks offer superior clarity, scratch resistance, and longevity. They are heavier and can crack if subjected to uneven surface pressure, but a properly supported glass tank lasts decades. Acrylic tanks are lighter and come in more custom shapes, but they scratch easily during cleaning and can yellow with age. For most setups, glass is the better long-term investment.

5. Rectangles vs. Cubes

Rectangular tanks provide more floor space, longer swimming lanes for active fish, and greater surface area for gas exchange. Longer tanks also reduce aggression in territorial species. Cube tanks are visually striking and work well in room-center positions where they are viewed from multiple sides. For most fish, choose the rectangle. For display aquascapes, a cube can be the better visual choice.

6. Tall vs. Shallow Aquariums

Long, shallow tanks are generally better: more horizontal swimming space, better gas exchange at the surface, and easier to maintain. Tall tanks need less floor space and suit certain aquascaping styles and species that use vertical space. A 20-gallon long outperforms a 20-gallon high for almost every community fish application.

7. Rimmed vs. Rimless

Rimmed tanks are structurally stronger, cheaper, and better protected against edge chipping. They hide the water line, which covers hard water stains between water changes. Rimless tanks look cleaner, work better for open-top setups, and create a seamless visual from tank wall to water surface that looks significantly better in a display setup. For a planted tank or aquascape where aesthetics matter, go rimless. For a utility setup, rimmed is fine.

Common Tank Setup Mistakes That Cost Money

Buying a tank before choosing the fish: tank size, shape, and filtration all depend on what species you plan to keep
Undersizing the filter: always buy a filter rated for at least 1.5 to 2 times your tank volume
Starting reef without experience in marine or freshwater systems first: crashes are expensive and demoralizing
Choosing an acrylic tank for high-maintenance setups: scratches accumulate quickly, especially on marine systems requiring frequent maintenance
Placing the tank near a window: direct sunlight drives algae blooms that no amount of maintenance can fully control
Buying a tank sized to fit a fish that is small at the store but grows very large: do the research on adult size before purchase

How To Choose Your Fish Tank

Size

Choose a tank size that fits your actual budget when fully equipped, not just the purchase price of the glass. A 75-gallon (284 L) tank that requires a $400 sump, $300 lighting, and $500 in rock to set up correctly costs very differently than the $300 sale price of the tank alone. Work backwards from your total setup budget, not forwards from what looks impressive.

The most common mistake I see: choosing tank size based on what you can afford to buy, not what you can afford to run. Bigger tanks need better filtration, more lighting (especially for reef setups), and more expensive livestock. Going large before you are ready leads to equipment shortcuts that make the whole experience harder and costlier. Get the size that fits your actual budget first. You can always upgrade later.

Marine vs. Freshwater

Freshwater gives you more species choices, lower equipment costs, more forgiving water chemistry, and a shorter learning curve. Saltwater gives you access to some of the most visually stunning animals on the planet, but at a significantly higher equipment, livestock, and knowledge cost. If you are genuinely unsure, start freshwater, run a successful tank for 12 to 18 months, then make the saltwater decision with actual experience behind you.

Placement

Choose your location before you buy. Measure the space. Confirm the floor can support the weight (water weighs 8.34 pounds/3.78 kg per gallon). Check the distance to the nearest electrical outlet. Avoid windows. Avoid high-traffic areas that generate constant vibration. A tank placed in a bad location is a permanent problem because moving a running aquarium is a major undertaking.

Tank Type	Min Size	Difficulty	Equipment Cost	Best For
Tropical Community	20 gal (76 L)	Beginner	Low	First tank, wide species choice
Cold Water	40 gal (151 L)	Beginner	Low	Goldfish, no heater needed
Planted	10 gal (38 L)	Beginner to Advanced	Low to High	Aquascapers, planted community
African Cichlid	55 gal (208 L)	Intermediate	Medium	Bold colors, active display tank
Brackish	30 gal (114 L)	Intermediate	Medium	Unique species, between fresh and salt
Saltwater FOWLR	40 gal (151 L)	Intermediate	High	Marine fish without coral complexity
Reef Tank	40 gal (151 L)	Expert	Very High	The pinnacle of the hobby
Freshwater Aggressive	55 gal (208 L)	Intermediate	Medium	Big personality fish, species displays

FAQs

What type of fish tanks are there?

The main tank types are tropical community freshwater, cold water, planted, African cichlid, freshwater aggressive, brackish, saltwater FOWLR, reef, and saltwater predator. Aquariums also vary by physical design: nano, all-in-one, reef-ready, glass or acrylic, rectangular or cube, rimmed or rimless.

Which type of fish tank is best for a beginner?

A 20 to 29-gallon (76 to 110 L) tropical freshwater community tank is the best starting point. It is forgiving of minor water chemistry variation, inexpensive to set up correctly, and gives you access to hundreds of compatible species. An all-in-one cabinet tank simplifies equipment selection and looks clean in any room. Avoid anything under 10 gallons (38 L) as a first tank; small tanks require more frequent maintenance and are less forgiving of mistakes.

What are the different types of freshwater aquariums?

Freshwater aquariums include tropical community tanks, cold water tanks (goldfish, koi, white clouds), planted aquariums (low-tech to high-tech aquascape), African cichlid tanks, freshwater aggressive setups, and brackish tanks. Each has different water chemistry requirements, equipment needs, and compatible species.

How much does it cost to set up a fish tank?

A basic freshwater community setup in a 20-gallon (76 L) tank runs $150 to $300 for tank, filter, heater, and initial livestock. A 55-gallon (208 L) African cichlid display runs $400 to $700 fully equipped. A saltwater FOWLR system starts at $600 to $1,000 minimum. A reef tank starts at $1,500 and commonly runs $3,000 to $5,000 for a serious setup with quality lighting, skimmer, and livestock.

Is a bigger fish tank easier to maintain?

Yes, within limits. Larger tanks have more water volume, which dilutes waste and stabilizes parameters more effectively than small tanks. A 40-gallon (151 L) community tank is more forgiving than a 10-gallon (38 L) with the same number of fish. However, very large tanks (over 125 gallons/473 L) require significant physical effort for water changes and cleaning, so they are not necessarily easier overall.

Mark’s Pick

The setup I recommend to almost everyone starting out: a 29-gallon (110 L) or 40-gallon (151 L) all-in-one freshwater community tank with a school of harlequin rasboras, a school of corydoras, and one centerpiece fish like a honey gourami or a single betta. Sand substrate, a reliable heater set to 76 to 78 degrees Fahrenheit (24 to 26 degrees Celsius), and weekly 25 to 30 percent water changes. That tank is forgiving, looks great from day one, and teaches you everything you need to know before moving to something more demanding. Most people who start there end up running three tanks within two years. That is how the hobby works.

Closing Thoughts

The right tank type is the one that matches your budget, your schedule, and your experience level right now. Not the one that looks best in someone else’s video. Every tank type on this list is rewarding when done right and frustrating when done underfunded or underprepared. Start with a clear-eyed assessment of what you can actually commit to, choose accordingly, and build from there. The hobby is deep enough to keep you interested for decades regardless of where you start.

Where to Buy Fish and Equipment

For livestock, we recommend buying from specialty online retailers over big-box stores. The health guarantees are better and the species selection is significantly wider.

Flip Aquatics – Quality freshwater fish with excellent health guarantees. Great selection of community fish, cichlids, and nano species.
Dan’s Fish – Reliable source for freshwater and some saltwater species. Good reputation for healthy fish and honest descriptions.

Want to learn more? This article is part of our complete Aquarium Equipment and Gear Guide, your ultimate resource for filters, heaters, lights, pumps, tanks, and more.

October 14, 2023

How Big Do Betta Fish Get? Size, Growth, and What Actually Makes a Difference
I’ve spent over 25 years keeping and working with bettas, and the size question comes up more than almost any other. Most bettas you’ll find at a fish store max out around 2.5 to 3 inches in a home aquarium. but the part that surprises people is the giant betta varieties, which can push close to 5 inches. That’s a completely different fish. Understanding betta size matters because it directly affects what tank you need, what you feed them, and whether your fish ever reaches its full potential. Here’s what I’ve seen actually make a difference.
Key Takeaways
- Most Betta fish species grow to around 2.5 to 3 inches in length maximum.
- The wild bettas may seem smaller in size than the captive counterparts due to their short finnage.
- The minimum tank size for healthy growth is at least a five-gallon aquarium.
- Betta fish care with a balanced diet and a well-maintained clean tank is an essential factor in letting your betta grow to its full size.
- During the first few days, the baby betta fish solely relies on the nutrients absorbed by the yolk sac and doesn’t need any additional food.
How Big Do Betta Fish Get?

As mentioned above, the average size of a full-grown betta fish is around 2.5 to 3 inches in length. However, some betta variants, like the giant betta fish tend to grow larger and can reach an average size of 4 inches in length and more. The size of your betta fish largely depends on many factors, such as water quality, food and diet, and a healthy environment.

How About In The Wild?

In their natural habitat, wild betta fish are the same size as their captive counterparts. However, due to their different colorful and body appearance (since wild bettas possess smaller fins), they might appear smaller in size.

Also, betta fish in the wild, are always in the fight or flight response, hence, always in stress. Therefore, their capacity to grow is not enough as compared to the captive, colorful species of home aquariums.

What Is The Minimum Tank Size For Them?

Many aquarists believe that betta fish will grow to the size of their tank. However, this is not the case. Betta fish may require free swimming space because an inadequate living environment may lead to a range of other health issues, including stunted growth in the fish species¹.

Generally speaking, a small tank size will hinder the betta fish growth, with internal organs growing to their full potential. This results in various health issues and reduced lifespan.

The minimum recommended tank size for a full-grown betta fish is a 5 gallon tank. The bigger, the better! That’s because smaller tanks accumulate waste products quickly, such as Ammonia, nitrites, and nitrates, that suppress the growth of fish and lead to more susceptible diseases.

Betta fish living and thriving in larger tanks are known to have a healthy life and larger fins, contributing to their overall size.

In my experience, while 5 gallons is the workable minimum for a single betta, I always recommend going larger. a 10 or 20-gallon tank is where bettas really shine. A bigger setup gives you room to add compatible tank mates, and you’ll see your fish behave more naturally with more space to explore. I’ve seen bettas in properly sized, well-planted tanks develop fins and coloration you’d never get in a cramped setup.

How Fast Do They Get To Adult Size?

Like other fish, betta fish grow the most during their early life stages and reach their full potential after 6 to 7 months of birth. It doesn’t take very long for baby bettas to get to become fully grown betta fish if kept in the right conditions.

However, there are a variety of factors that play a crucial role in their overall growth. For example, water quality and water parameters.

After the first few days of hatching, betta fry absorbs the nutrients from the yolk sac and doesn’t need any additional food. However, after a few weeks, they begin to move and eat microscopic food, such as infusoria. During this time period, the growth is quick with high-quality feedings. Once your fish is 1 to 2 months of age, betta fish eat brine shrimp or blood worms.

However, 2 to 3 months is an important age for growth and development. During this time period, betta fish require a high amount of protein to become big with vibrant colors and healthy long fins.

After 6 months, the betta fish is considered an adult, and their growth rate will slow down at this point considerably.

How To Make Them Grow Faster

We all know that betta fish are considerably smaller fish than many fish species. However, with the right and healthy fish environment, they get reach their maximum size; 3 inches in length.

Of course, to achieve a bigger and more beautiful betta fish, you need to work hard!

Tank Size

First of all, consider the tank size. Many pet stores keep betta fish in small containers, cups, or tiny bowl to save space because you can keep a single betta fish in a small container. This practice is detrimental to the mental and physical well-being of your betta fish and may affect their growth adversely. Therefore, it’s essential to provide at least 5-gallon fish tanks for your betta’s healthy survival.

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Clean tank

Make sure to do 20% water changes every other way for a healthy and bigger Betta fish. That’s because betta fish excrete a lot of waste and a hormone that inhibits their growth. Therefore, removing at least 20% of water every other day is crucial for their maximum growth.

Water temperature

Maintaining a temperature range of 72 to 83 degrees is crucial to keep the body working properly because temperature changes can be stressful to your fish, inhibiting their growth.

Balanced diet

A balanced diet is key to the healthy survival of your betta fish. Make sure the diet of your fish contains lots of fiber and protein. You may feed your fish bloodworms, earthworms, freeze-dried bloodworms, and freeze-dried foods to encourage healthy growth. Only feed twice or thrice a day and remove the leftover food to prevent water contamination.

Water quality

Besides being a hardy fish, Betta splendens are still prone to many common aquatic diseases. Therefore, pristine water conditions combined with a balanced diet and well-maintained aquariums with live plants or fake plants can lower the stress.

Lighting conditions

The right lighting conditions are essential for the proper growth of your betta fish. Make sure to provide a natural light pattern for your bettas. i.e., natural day and light patterns. This means that only natural lighting is not enough.

Proper artificial lighting that are dimmable or adjustable are highly recommended. Also, it’s important to place your tank in the right location where it doesn’t allow direct sunlight. For example, away from windows and doors because direct exposure to sunlight cause serious issues in water parameters. Ultimately affecting the health of your bettas. Additionally, natural sunlight may encourage algae infestation in your tank.

Proper filtration

Many aquarists believe betta fish grow just fine in an unfiltered tank, but I’ve noticed a significant difference in the health and growth of Bettas that grow in a filtered tank.

I highly suggest installing a filter if your tank is bigger than 5 gallons to keep water conditions pristine and in optimal ranges for proper maintenance.

Filters reduce the production of harmful bacteria and parasites in your tank and help with oxidation and nitrification.

Choosing the best filter for your betta fish depends on various factors such as your tank size, the number of fish in your tank, etc. Just remember that Bettas are not good swimmers, so strong water currents may stress them out. Therefore, an adjustable power filter is highly recommended.

After 25 years in this hobby, the two mistakes I see most often that hold bettas back are buying too small a tank and feeding a poor diet. A betta in a tiny bowl getting flake food is never going to reach its potential. in size or overall health. Quality pellets supplemented with frozen or live food make a real difference in how a betta develops and how big it ultimately gets.

FAQS

Do betta fish grow in bigger tanks?

Even though the tank size doesn’t influence the growth of betta fish much, bigger tanks are still recommended because lack of free swimming space may cause an inadequate living environment for the fish which may lead to many fish diseases, including stunted growth.

Is it better to have 1 or 2 betta fish?

If you have a small tank. 5 or 10 gallons, then it’s not recommended to keep more than one betta fish. However, if you have bigger tanks over 20 gallons, you can keep two betta fish in the same tank.

How big of a tank do I need for a betta fish?

The minimum tank size for a single betta fish is 5 gallons. However, if you want to keep two or more, you should get a tank bigger than 20 gallons.

Can betta fish grow bigger?

When provided with pristine water conditions and balanced food, betta fish grow to its full potential, 3 inches in length. But anything above 3 inches is nearly impossible.

Can a betta have too big of a tank?

No. There’s nothing as a huge tank for Betta. Betta splendens are highly active fish with filters and heaters installed for their healthy and happy survival. Therefore, if you can accommodate and afford a bigger tank for your fish, happily provide them with all the space they deserve!

How big should my betta fish grow when they breed?

The best time for your betta fish to breed is around 6 to 18 months because they are now adults and in their fittest form.

Are female betta fish and male betta fish the same size?

No, upon careful examination, you will notice that male betta fish have thicker bodies and larger fins and bodies than female betta fish. The average size of male bettas is around 2.5 inches to 3 inches. However, female bettas reach a maximum of 2.5 inches in size.

Final Thoughts

How big do bettas get is not a mystery anymore! The average betta fish grows around 3 inches in length, which is quite small as compared to other freshwater fish. However, make sure to provide them with the best water conditions, water temperature, and diet requirements and you’ll have beautiful happy friends for years to come.

📘 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.

References
- Seriously Fish — Species profiles and care data
- FishBase — Taxonomy and scientific data
- Practical Fishkeeping — Husbandry and care advice
October 11, 2023
Betta Fish Water Guide: What I Use After 25 Years and How to Treat It Right
I’ve kept bettas for over 25 years, and water quality is the single biggest variable that separates healthy bettas from struggling ones. My go-to is RO water with remineralization, or distilled water treated the same way. it gives you full control over what’s in the water rather than relying on whatever comes out of your tap. If you’re looking for the simplest answer, RO water is what I reach for. Here’s a breakdown of every water source option and how to use each one correctly.
Key Takeaways
- Not all water is created equal and a good source of water will impact the success of your betta fish tank.
- Betta fish water conditions should be slightly acidic with a low general hardness.
- Tap water, bottled spring water, and well water are some of the most popular source water options for betta fish.
- The cleanest source waters are reverse osmosis water and reverse osmosis deionized water while the dirtiest come from nearby lakes and rivers.
Why It Matters

Like all fish, betta fish need water. Water provides the fish with dissolved oxygen and minerals that are essential for bodily processes. But betta fish can’t live in just any water.

Betta fish are hardy fish that can adapt to a large range of water conditions. Even these small, endearing fish have limits.

The best way to understand what kind of water betta fish need to thrive is by looking at their natural habitat. Betta fish live in stagnant, temporary pools throughout Southeast Asia. These floodplains and rice paddies are often filled with organics and other vegetation that lower pH levels and water hardness. The water temperature is nearly constant between 78-80° F¹.

At the same time, betta fish have been bred in standard aquarium water parameters for decades. Most of these freshwater fish have never experienced those conditions seen in their natural habitat. Still, their bodies are unable to adapt to some of the more extreme parameters outside of their preferred range.

Many aquarium hobbyists find betta fish success in tap water, well water, distilled water, and bottled water.

Betta Fish Water Sources

There are many different types of water for betta fish. One of the most popular options is to use tap water, but the parameters of tap water vary greatly from one location to the next and may not be right for your aquarium. Luckily, there are other inexpensive options that can give the best betta fish water conditions.

1. Tap Sources

Most hobbyists have access to running tap water. Tap water is convenient and readily available while also being temperature-ready when needed. There are a few problems with tap water, though.

The parameters of tap water can vary greatly by location. Tap water is a public resource that is influenced by water facility treatments and storage. While water sits in a reservoir, it is influenced by its environment. This means that water parameters like hardness and pH can be changed by factors such as runoff and minerals. Phosphate and silicate may also be introduced, which are often related to algae problems in betta fish tanks.

Tap water is also heavily processed in order to be safe for consumption. This means that chemicals such as chlorine, chloramine, fluoride, and others are added daily.

Luckily, aquarium water conditioner products, like SeaChem Prime, remove chlorine and chloramine while detoxifying the ammonia that may come from that reaction. Not every water conditioner will treat tap water in the same way, though.

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Most water conditioner options won’t treat pH or hardness, so those parameters will need to be manually adjusted. That being said, there are many water conditioner brands that offer a stress coat additive that can help protect and repair the fish’s mucus layer. Always make sure you use a condition when using tap water as untreated water can quickly kill your fish!

Another issue to consider with tap water is the quality of the pipes that the water is traveling through en route to your house. Unfortunately, many pipes contain rust and lead, which could unknowingly leach into the aquarium.

Pros
- Readily available and inexpensive
- Contains important minerals that betta fish need
- Water temperature can be easily adjusted for immediate use
Cons
- Contains harmful chemicals like chlorine and chloramine
- Influenced by natural factors that can make for unideal parameters for betta fish tanks
- Affected by water pipes
2. Bottled Water

Bottled spring water is one of the oldest sources of water for betta fish. You might’ve been told to use bottled water when you won a goldfish from the fair, and that’s for a reason.

Bottled water is considered to be one of the most consistent sources of water as it’s been treated to be 100% pure. This water has been specifically filtered to remove harmful chemicals while being adjusted for mineral levels. Bottled water is dechlorinated, but can vary greatly in pH levels across different brands.

Some aquarium brands have taken the initiative to create specially prepared betta water that meets the parametric needs of bettas. This water is more expensive than usual, and some hobbyists may question how it differs from other popular bottled spring water brands meant for drinking.

It’s also important to note that while water may be labeled as being purified water, this may be a marketing tactic that makes the water more appealing despite still containing contaminants. Even if using bottled water, it is still necessary to regularly use an aquarium test kit to test water parameters for fluctuations.

Pros
- Consistent parameters that meet the water brand’s standards
- Pre-dechlorinated and filtered
- Easy to store for long-term use
- Betta-specific water brands
Cons
- Stored in plastic that could leach unknown toxins
- pH and mineral levels may vary between brands
- Contributes to single-use plastic waste
- Expensive
3. Well Water

Well water is one of the most inexpensive options on this list for good source water for betta fish. This water originates from an underground aquifer, which means that it’s affected by environmental factors.

Again, well water parameters will depend on the minerals and nutrients of the aquifer that holds the water. Because of this, most well water has high hardness, which may need to be adjusted for before use in a betta tank. However, many beneficial natural minerals and nutrients also seep into the water, which can make for a healthy fish.

Well water is some of the purest water you can get for a betta fish tank as it is untreated and free from chemicals and other additives.

Pros
- Contains natural minerals and nutrients that are beneficial to plants and betta fish
- Relatively consistent water parameters
- Betta owners have control over additives and parameters at the source
- Readily available and free
Cons
- Needs to be tested and managed by individual hobbyists
- Parameters and overall water quality are not officially regulated
- Potential to temporarily dry up or run low during drought
4. Distilled Water

Distillation is the process by which water is boiled and the steam is then collected and cooled. Through this process, this new distilled water is demineralized and purified of most other contaminants.

For the most part, distilled water has only hydrogen and oxygen bonds. All other minerals and chemicals have likely been removed. While a good source of water, distilled water cannot be used by itself in the aquarium. This is because distilled water lacks important nutrients, like calcium and magnesium, that fish and plants need.

There are two ways to successfully use distilled water. The first way is to remineralize it, which can be done by adding aquarium-specific liquid or dry products. This is especially appealing for hobbyists keeping sensitive species that need very specific parameters.

The other way to use distilled water is by mixing it with another type of water that contains minerals, such as tap water or well water. This is especially effective if those sources introduce too many minerals at once, leaving the distilled water to dilute those amounts. This can also be a cost-effective solution for using distilled water as refills can become expensive over time.

While distilled water usually doesn’t need to be dechlorinated, it is always a good idea to preemptively dose for chlorine and chloramine.

Pros
- Base water (hydrogen and oxygen) without minerals or other additives
- Easy to dose with liquid and dry minerals for betta-specific water parameters
- Easy to find at grocery stores
Cons
- Lacks essential nutrients and minerals necessary for aquatic life
- Neutral pH which may need to be lowered for some bettas
- More expensive than other sources of water
5. Reverse Osmosis Water (RO)

Reverse osmosis water, otherwise referred to as RO water, is most commonly used for saltwater aquariums but can be used in betta tanks as well. This type of water is purified by being pressured through a semipermeable membrane that helps remove minerals and other toxins.

This is the water source I personally use for my bettas. RO water gives you a clean baseline. no chlorine, no chloramines, no unpredictable mineral content. You remineralize it yourself and know exactly what your fish are living in. For bettas especially, that level of control makes a real difference in long-term health.

While some fish stores may sell pre-processed RO water, most hobbyists install an RO system in their homes, which requires regular filter changes and replacements. Like distilled water, RO water provides a clean slate for hobbyists to add minerals and nutrients to their liking for bettas and other tank mates.

Pros
- All-in-one water purification system
- Purified water with little to no nutrients, minerals, or chemicals
- Easily remineralized for sensitive species
Cons
- Source water parameters need additional configuration
- Regular filter replacements and other maintenance
- Start-up costs are high
6. Reverse Osmosis Deionized Water (RO/DI)

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Reverse osmosis deionized (RO/DI) water is the purest water you can get for your aquarium. This water is similar to RO water but features an extra deionization stage that nearly eliminates all total dissolved solids (TDS). TDS are any dissolved solids, including most heavy metals, that are present in water. RO/DI water reduces TDS levels to nearly 0 ppm.

However, betta fish, plants, and invertebrates cannot live in 0 ppm TDS. These levels, along with pH, micro, and macronutrient levels, would need to be adjusted accordingly for a betta. To be the most cost-effective, it’s only recommended to use RO/DI if keeping other fish tank systems or very sensitive species. The trade-off is that RO/DI can be completely customized for the given tank setup.

Pros
- All-in-one RO/DI system
- The purest water with neutral pH, minimal nutrients and minerals, and low TDS
- Water parameters can be adjusted as needed with dosing and other supplements
Cons
- Additional products needed for water parameter configuration
- Regular maintenance is required for RO/DI system upkeep
- High start-up cost and continued maintenance expenses
7. Rain Water

Bettas are hardy fish that can adapt to a wide range of water parameters. So much so that they find themselves in rain-filled puddles that come and go with the wet and dry seasons.

If bettas can live in these far-from-perfect conditions then can they live in natural rain water?

It’s not usually recommended to keep any fish in harvested rain water. Rain water can have very different water parameters from your tank as well as from one collection to the next. Harvested rain water is often softer and more acidic than other sources of water, which is ideal for betta fish. However, the exact levels for these parameters may be too extreme or vary too much.

The bigger concern with using rain water for betta fish is pathogens. Wild betta fish have built up an immunity to naturally borne illnesses in their environment. Most betta fish available at your local pet store have been selectively bred for decades, which means they haven’t had to build up an immunity against those microorganisms and pathogens that might occur in rain water.

Other unknown factors that could be in rain water include acid rain, fertilizers, pesticides, and other harmful contaminants.

How to Make Betta Fish Water from Rain Water

If you’re confident in the quality of your rain water, then there are a few suggested methods to make it safe for betta fish use.
1. Collect the water from a trusted source. If you live in a polluted area, then the rain water will also likely be polluted. Collect water far from areas of pollution and treat it immediately.
2. Screen the water. Passing the water through a fine strainer will remove large contaminants, like insect larvae, rocks, decaying organics, and other macroscopic pieces that need to be removed.
3. Purify the water. There are many ways to purify rain water for betta fish water use: boiling the water, running it through activated carbon, placing a UV sterilizer in the container, or using a RO or RO/DI system. It’s recommended to use at least two of these methods whenever harvesting your own rain water. For good measure, it’s also recommended to use a water conditioner even though chlorine and chloramine might not be present.
4. Test parameters. Use a trustworthy water test kit to test levels of all the nutrients present, including ammonia, nitrite, nitrate, pH, phosphate, and water hardness.
5. Adjust the water accordingly. As mentioned before, rain water is typically soft and acidic. You may need to add in additional dosings to raise levels to the desired ranges.
Pros
- Easy to collect
- Soft and acidic to match the preferred parameters of betta fish
- Often free of harmful substances found in tap water, like chlorine and chloramine
Cons
- Contains many unknowns in regard to pathogens and nutrients
- Rain water parameters can vary greatly
- Somewhat difficult to make safe for betta fish
- Limited by rainfall totals
8 Natural Sources

If you’re somewhere it doesn’t rain a lot but are surrounded by bodies of water otherwise, you might consider using a local lake or river for your betta fish water. Unfortunately, natural sources cause many of the same problems that rain water can.

In addition to harmful pathogens, bacteria, and viruses along with fluctuating parameters, natural lakes and rivers can also inadvertently introduce invasive species into your system. Unless you live in a perfectly protected area of wildlife preserve, chances are that there are invasive species at all levels of the food chain. The most common hitchhikers are insects and snails, especially if collecting live plants. However, much more harmful bacteria and viruses can also be introduced into the tank through natural sources.

While natural water might look safe to use, it can be filled with pollution, fertilizers, and pesticides just as much as rain water can. As mentioned before, the organisms living in these ecosystems have likely built a tolerance to these harmful substances, allowing them to live there indefinitely. Domesticated betta fish, on the other hand, would quickly succumb to untreated water from these locations.

In general, it is best to keep nature in nature and use tried and true sources of betta fish water.

The most common water mistake I see. even from experienced keepers. is forgetting to use water conditioner. It sounds basic, but when you get busy and your tank is only 5 or 10 gallons, it’s easy to skip. A small tank with untreated tap water can harm a betta fast. My advice: keep your conditioner right next to the tank so it becomes part of the routine, not an afterthought.

Pros
- Using natural sources can make it feel like you’re making a natural aquarium biotope for your fish
- Free from added chlorine and chloramine
Cons
- May contain harmful pathogens and other invasive species
- Can be affected by pollution, fertilizers, and pesticides
- Fluctuating water parameters
FAQS

What kind of water do you use for betta fish?

Treated tap water is usually the best type of water to use for betta tanks. Tap water benefits include a relatively neutral pH, the presence of nutrients and minerals, and being readily available for use at any time. If doing frequent water changes, it is also very convenient to be able to adjust the water temperature without an aquarium heater before adding the water to the tank.

Keep in mind that tap water parameters will vary by location. The parameters mostly affected by geographic location are pH and general hardness. If these levels are too high, you may be left to look for another source of water to use.

Can betta fish survive in tap water?

Yes! Betta fish can live in tap water perfectly safe. In fact, tap water is the most preferred water to use for betta fish aquariums.

However, untreated tap water that hasn’t been dosed with a water conditioner can be deadly for betta fish. Tap water is regularly dosed with chlorine and chloramine which make water safe to drink. Unfortunately, these compounds are deadly to fish and invertebrates and need to be removed.

How do you prepare the water for a betta fish?

Depending on what kind of water for betta fish you choose to use, preparation will vary. If using tap water, bottled water, or well water, then you will likely only need to use water conditioners to remove chlorine and chloramine.

If you decide to go natural with rain water or local rivers and lakes, then a lot more preparation is needed. Treating these sources will take several steps of filtration and processing.

Though RO and RO/DI water shouldn’t contain harmful chemicals, it is still recommended to treat them as you would treat tap water with a water conditioner. These source waters will also need to be remineralized and adjusted for pH.

Do betta fish need anything in their water?

While you might think water is only hydrogen and oxygen, there is a lot more that is necessary for your betta fish’s success. Most importantly, minerals and nutrients, like calcium and magnesium, play important roles in the physiological processes of fish, plants, and invertebrates. Altogether, these minerals and nutrients play into the general hardness levels of the tank water.

Dissolved oxygen is also essential for aquatic life. Oxygen levels can deteriorate in stagnant conditions or when there is a lot of decay in the ecosystem.

What is the best bottled water for a fish tank?

The best bottled water for betta fish is bottled spring water with a relatively neutral pH and soft general hardness. This can be difficult to find as these parameters are not usually listed on the bottles. You may need to purchase several brands of water and test parameters for ones that meet your desired levels.

There are several aquarium products available for betta-specific water. One of these products is pre conditioned Fritz Betta Water. This water has been treated with a conditioner and has added tannins from Indian almond leaves for lowered pH and general hardness.

While good in a pinch, these premade waters can become expensive to use over time. In addition, they are easily replicated at home with some extra preparation.

Can I put spring water in my betta fish tank?

Yes! The best spring water to put in a betta fish tank has been filtered and bottled. However, if you have a natural freshwater spring by your house, you may be tempted to take it directly from the source, which is not recommended.

Though this water might look clear and refreshing, there is still a good chance that it contains pathogens and other harmful chemicals that can hurt your fish. If planning to take water from a natural spring, process it as much as you would for water from a lake or river.

Final Thoughts

A good fish tank starts with good water. Betta fish prefer slightly acidic and softer water than other tropical fish, so it’s important to pick a water that sets your fish up to thrive.

In general, the most popular betta fish water is tap water. Well water and bottled water are also good alternatives that provide a good basis for dosing other additives as needed. If you want the purest water possible, RO or RO/DI water will provide a clean slate for however you choose to make your own water!

📘 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.
October 10, 2023
How To Acclimate Betta Fish: My Preferred Method and the Mistakes to Avoid
Acclimation is one of those steps new fishkeepers often skip because it seems unnecessary. but after 25 years in this hobby, I can tell you it makes a real difference, especially with bettas. My go-to is the drip method. It takes longer, but it’s the gentlest way to introduce a fish to new water, and with bettas, gentle matters. Here’s how both methods work, which one I reach for, and the mistakes I see most often that stress or kill new fish before they ever settle in.
Key Takeaways
- Set up and cycle your betta’s tank long before you buy your fish.
- Avoid moving a new betta fish directly from its bag or cup and into its new tank. Rather acclimate slowly to help your betta fish survive the change in water parameters.
- Choose an acclimation method that you feel comfortable with. Different aquarists use different methods, but it’s always best to stay cautious and keep your pet’s safety in mind.
- Consider quarantining your new betta before adding it to a community tank to protect your other fish from diseases spreading inside their tank.
- Consult an aquarium specialist if you’re uncertain about how to acclimate and care for your betta.
Why Do We Need To Do It?

Moving a new pet fish between the transfer cup or bag it was transported in and the fish tank where it is going to live can be very stressful for your pet¹. According to a study by The University of Queensland, fish are subjected to lots of stress when transported, as quoted below:

Common stressors associated with live transport are inappropriate handling, air exposure, food deprivation, poor water quality, inappropriate transport densities, sudden changes in water temperature, and rapid water movement
School of Veterinary Science, The University of Queensland

Being in the aquarium hobby for over 25 years, I’ve seen it all and continue to see Betta fish quickly placed in poor conditions. Part of this issue is how the pet store exhibits these fish in tiny containers when selling them. Every new Betta owner I advised in person I got through these same steps. I hope I can get you in the know how to give your Betta the best start possible in its new home.

The conditions at the store or breeding facility where you got your betta fish are probably very different from the conditions you will be providing for your new pet. That’s why it’s important to make the transition as smooth as possible.

The process of carefully introducing your betta to its new home is known as acclimation, and it’s a vital first step!

The New Tank

This article is about how to acclimate betta fish, but we can’t move on without (briefly) discussing their new tank setup first. Let’s run through some of the basic requirements for a great betta fish tank setup.

Tank Size

Each aquarist has their own preference for tank size, but I recommend a tank of at least 5 gallons for a single betta fish.

Heating

Bettas are tropical fish, which means they need warm, stable temperatures in the range of about 76-81 degrees Fahrenheit. You will need a small aquarium heater of 25-50 watts to heat your tank.

Filtration System

Your betta tank needs a small aquarium filter to house beneficial bacteria and keep the nitrogen cycle running safely. I recommend a small sponge or HOB filter for a small betta fish tank, but be sure to select a model that fits your tank size.

Editor’s Choice

Hikari Bacto Surge Sponge Filter

The Best Sponge Filter
With a name brand and high quality reputation, the Bacto Surge separates itself from the pack

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Cycling Your Aquarium

Many beginner fish keepers add fish to a brand new aquarium without giving the system a chance to cycle. This can lead to a common and dangerous side effect called new tank syndrome, and that’s something you definitely want to avoid!

There are many ways to cycle your tank, and the process can take several weeks, depending on your chosen method. The idea is to introduce nutrients into your tank water and then allow beneficial bacteria to colonize your filter media and get the nitrogen cycle up and running.

With a source of ammonia in the water, like some fish food or live plants and some fertilizer, bacteria colonies will begin to develop on their own. However, you can get faster results if you add nitrifying bacteria in a bottle or some filter media from an old tank.

Whichever method you use, you’ll need to monitor your ammonia, nitrite, and nitrate levels to know when your tank is ready to add fish. Your tank is cycled when it has shown readings of ammonia, and then nitrite, and then finally shows some nitrate but zero ammonia or nitrite.

Want to learn more about aquarium cycling? Check out my guide to fishless cycling for an in-depth look at this important process!

Water For Your Aquarium

Are you wondering which aquarium water to use in your betta tank? It may seem like an obvious question, but many fishkeepers overlook this important choice.

Tap water is probably fine (depending on your area), but you’re going to want to test your pH, hardness, and nitrate levels to give you a baseline reading.

Tap water is typically treated with chlorine or other chemicals to keep it safe for human consumption. Unfortunately, this can be harmful to your fish, so make sure you treat your tap water with a water conditioner/de-chlorinator before introducing your fish.

My Pick

Seachem Prime

Seachem prime is a easy to use and affordable choice when it comes to remove chlorine and chloramines from your tap water. Highly recommended!

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Don’t worry if your tap water is not suitable for betta fish – there are other options. Rainwater or well water is often suitable for a small tank, but you can also use RO/RODI water. However, RO water contains no minerals, so you’ll need to remineralize it with a product like Seachem Equilibrium and an Alkaline Buffer.

Water Parameters

Fish are sensitive creatures and they are affected by all sorts of things that we can’t see. Your betta will do best in the following water parameters:
- Temperature: 76 – 81°F (24 – 27°C)
- pH level: 6.5-8
- Water hardness: 5-20 DH
- Ammonia: 0 ppm
- Nitrite: 0 ppm
- Nitrate: 10-20 ppm
How to Acclimate Betta Fish To A Community Tank

Adding a new betta (or any new tank mate) to an established community tank is risky.

Very often, the betta fish you buy from larger pet stores are not in good condition. They may have been kept in a small cup where the water is not temperature controlled and filtered, and this causes stress, which weakens their condition and can cause infections and illness.

Unfortunately, these infections can spread to your other fish, and that’s why it’s so important to quarantine and treat new fish before adding them to a community tank.

Now, this step is optional, especially if you know your fish has been well-cared for and is in great condition. However, if your new pet fish is showing any signs of poor condition, you should definitely quarantine him or her to be on the safe side.

Setting Up A Quarantine Tank

A quarantine tank does not need to be a large or carefully decorated aquarium. A plastic tote or a small tank that holds a few gallons of water will work just fine. It does not need any substrate, but it should have its own filter, air stone, heater, and a secure lid to prevent your fish from jumping out.

Fill your quarantine tank with about 50% water from your community tank and 50% dechlorinated tap water. It’s a good idea to seed the filter with some media from your community tank filtration system to jump-start the nitrogen cycle too.

Acclimate your betta carefully to the water in your quarantine tank and observe it for 2 to 4 weeks before moving it to the community tank. During this time, you can treat the new fish with aquarium salts and medicate if you notice any signs of illness.

Avoiding Unwanted Pests

The water in the tank at your local pet store or in the plastic cup your betta fish came in may contain some things you really don’t want to put in your community tank. Organisms like parasites, invasive plants, or even pest snails can easily go unnoticed, so you want to avoid adding any of the original water to your own tank.

One simple way to do this is to net your betta out of its plastic bag after acclimation and then add him/her to your aquarium.

Now that we’ve covered some of the most important concepts you need to know about betta acclimation, let’s dive in and learn about two highly effective methods!

Method 1: Gradual Water Switch Acclimation

This is the faster of the two methods and works well for most situations. Use this technique to adjust the water temperature and parameters in the betta’s bag or transfer cup before adding it to its new home.

This technique is easy to perform but can take an hour or more to do properly, so make sure you don’t have any other commitments.

Let’s take a look at the basic procedure.

Supplies needed:
- Clothes peg
- Thermometer
- Small, fine mesh fish net
- Small cup or jug
1. Prepare the New Tank

I’m assuming you already have an aquarium ready for your new pet fish. The aquarium water is cycled, the temperature and parameters are correct, and you already have lighting, substrate, and decorations in place.

If you don’t yet have a cycled betta aquarium set up, you’re going to need to return your fish or do a fish-in cycle. This is not ideal for the health of your pet but it is possible with careful management of water quality.

Tips
- Check out my guides to betta fish care and tank setup to learn how to create a great betta tank!
- Set up your tank in advance and learn about the nitrogen cycle to avoid new tank syndrome.
2. Purchase Your New Pet

Take your fish straight home if you’re collecting your betta from a store. Your fish will be packaged either in a bag or a cup, and you should take great care to keep the container from getting punctured and leaking out.

I recommend transporting the bag or cup in a small cooler (no ice!) if you need to travel in very high or low temperatures and avoid shaking the container too much in transit.

Tips
- Buy from reputable fish retailers and breeders that take good care of their livestock
- Buy just one male betta fish if you have one aquarium
3. Float the Bag/Cup

Once you’re home, go ahead and add the bag or cup to tank so that the temperature can begin to equalize with your tank water. Let it float at the surface but make sure the bag or cup does not leak into your tank. You should open the transfer cup lid or bag and secure it to the side of your tank. Keep the lights low during this process to limit stress on your fish.

Tips
- Use a thermometer to measure and compare the water in your tank and in the bag
- A clothes peg works great for securing a fish bag to the rim of your tank
4. Add and Remove Water

Now it’s time to start acclimating your fish. Remove and discard about 20% of the water from the cup/bag and replace it with the same amount of water from your tank.

Wait 15 minutes or so and repeat the process. Do this four or five times until all the water in the bag is new tank water, and the temperatures are completely equalized.
- Try to avoid adding any water from a fish store or someone else’s tank to your aquarium.
5. Transfer Your Pet

Now you can transfer betta fish to its new home! Remove the betta fish from its bag or cup with a net and add it to the tank. Consider keeping your aquarium lights off for a day or so to let the fish adapt to its new environment in peace.

Method 2: Drip Method Acclimation

There is an even smoother betta acclimation process that you can use to minimize the chance of transfer shock. This technique takes a little longer, but many aquarists report excellent results!

This is the method I personally use. The drip method takes more time but gives your betta the smoothest possible transition. water parameters shift gradually rather than all at once, which reduces stress significantly.

Let’s take a look at the basic steps of drip flow acclimation. You can also use a kit, though I usually recommend a kit for saltwater fish or inverts.

Get For Acculimation

Accudrip Acclimator

Most of us know that fish and shrimp are sensitive creatures, who don’t do well with sudden changes. The Accudrip Acclimator is here to help adjust your aquatic creatures to new tanks and conditions

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Supplies needed:
- A few feet of airline tubing
- A T-valve and a bleed valve
- A plastic container or small bucket
- Small air pump and airstone
- Small fine mesh fishnet
- Thermometer
1. Tank setup

Again, I’m assuming you already have a cycled betta tank set up and ready to go for your new pet.

2. Set Up a Separate Container

Set your betta fish in its cup or bag in an empty bucket or other plastic or glass container that can hold at least a few gallons. Position your container on the floor below or next to your aquarium, but make sure the bottom of the container is not above your tank’s water level.

Tips
- Place a towel around the area and have a few rags nearby in case you spill some water
3. Aerate the Water

Drip acclimation can take an hour or more, so it’s a good idea to keep your betta fish oxygenated during the process. Run an airstone in the cup or bag that your betta fish was bought in, but be very careful not to hurt your fish with the stone. You’ll also want a bleed valve on the airline tubing to keep the airflow really low.
- Do not use a large, powerful air pump for this step
- The airstone can injure your fish if it moves around in the bag/cup. Secure the airline tubing to the rim of the bucket to prevent movement
4. Start the Drip

Add a T-valve (flow control valve) to a length of airline tubing that is long enough to reach from your tank down into your betta’s bag or cup. Suck on the hose to start a siphon, and turn the flow down with your valve to where there’s about one drop per second.

Tips
- Secure the airline tubing to the rim of your tank with a clothes peg or your aquarium hood
- Try to avoid getting tank water in your mouth
5. Acclimate Your Betta Fish

Let the tank water drip into your betta’s bag or cup for an hour or two. Don’t worry if the water overflows into the bucket during this process. Once your betta has acclimated to the new water, catch the fish in your net and add it to its new home!

Common acclimation mistakes to avoid: The biggest one I see is people just dumping the fish straight into the new tank. no acclimation at all. Second is skipping the temperature match, so the fish goes from cold transport water into a warm tank and goes into shock. Third is not knowing the water parameters of either tank beforehand. Take two minutes to test both and you’ll avoid a lot of unnecessary losses.

Tips
- Don’t add the old transport cup water back into your tank
- Top up your tank with new, dechlorinated water instead
FAQs

How long does a betta need to acclimate?

Some fish keepers acclimate their fish for just 15 minutes to equalize the water temperature, while others stretch it out for up to two hours during drip acclimation. In most cases, 30 minutes to an hour is enough to safely acclimate a betta.

Can I put my betta fish in a new tank right away?

Many new and experienced fishkeepers simply add bettas directly to their tank, although this can be very risky for the new betta and the other fish. Fish to the new before cycling shouldn’t be done!

At the very least, you should float the new betta in its transport bag to slowly equalize the water temperature, although a gradual water switch or drip acclimation process is even better.

How long can bettas stay in the cup?

Betta fish might survive a few weeks in a cup, but this is a really unhealthy environment for these beautiful creatures. It’s best to move them from their temporary container to their new tank as soon as possible after slowly acclimating them to the new tank’s water.

How do you acclimate betta fish?

You can slowly acclimate your betta fish by floating its open bag or cup at the water’s surface of its new tank. Add a small amount of new water to its bag every 10 – 15 minutes and discard an equal amount of old water from its transport container. Use a net to transfer your betta fish to its new environment after about an hour.

Do you have to let a betta fish acclimate?

You should always acclimate a betta so that it can slowly adjust to the conditions of its new home. This will reduce stress and give it a healthy start to its new life in your care.

Do I have to wait 24 hours before adding betta fish?

You can add your betta fish to its new surroundings right after acclimation if the water in its new tank is cycled and its temperature and parameters are correct.

Final Thoughts

I hope the suggestions in this guide make it easier to acclimate your betta to its new environment! My number one tip to make the process as smooth as possible is to prepare ahead of time. Do this by setting up your betta tank and preparing everything you need for the acclimation process long before you buy your fish.

If you’re just starting out with betta fish keeping, go ahead and check out some of my other helpful guides on betta fish care, tank mates, tanks set up, and how to cycle your aquarium!

📘 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.
October 9, 2023
Betta Fish Toys and Enrichment: What Actually Works (And the Mistake Most Owners Make)
EXPERT TAKE | MARK VALDERRAMA

Bettas are more intelligent and more sensitive to their environment than most people realize. After 25 years in this hobby and time managing fish stores, I have seen the difference a well-structured tank makes on a betta’s behavior, color, and lifespan. The fish that live in bare tanks with nothing to interact with are not thriving, they are surviving. Enrichment is not a luxury. It directly affects how long and how well these fish live. The Zoo Med Floating Log is the one item I point most people toward first, and the bigger lesson is this: structure beats novelty every time.

Bettas are more curious and intelligent than most people give them credit for. Enrichment makes a real difference in how they behave and how long they stay healthy. I’ve seen a lot of these products come through fish stores over 25 years, and the Zoo Med Floating Log is the one I’d point most people toward first. But the bigger point is this: don’t overthink it. The most common mistake owners make is trying too hard, constantly rearranging the tank, adding new objects, too much stimulation. Bettas do best with good structure they can settle into and explore on their own terms.

A bored betta is a stressed betta. And a stressed betta is a sick betta.

WHY THIS RANKING

Each item on this list was evaluated on three criteria: how likely a betta is to actually interact with it, ease of use for the owner, and safety for the fish. Items that look fun in marketing photos but go untouched in real tanks did not make the list. Items that cause stress with overuse are noted clearly. Enrichment that mimics natural behavior ranks highest.

What People Get Wrong About Betta Enrichment

The most common misconception is that bettas need constant novelty to stay engaged. They don’t. What they need is a stable, structured environment with places to hide, rest, explore, and occasionally interact. A betta in a well-planted tank with a floating log and a leaf hammock is more enriched than one in a bare tank with ten rotating toys.

The second mistake is leaving stimulation items in permanently. The Zoo Med Exercise Mirror is a good example: brief exposure triggers natural territorial behavior and provides real engagement. Leave it in all day and the betta cannot escape the perceived rival. That turns stimulation into chronic stress. The same principle applies to rearranging tank decor constantly. Bettas establish territory. Disrupting that territory repeatedly stresses them out.

FROM THE STORE FLOOR | MARK VALDERRAMA

At the fish stores I managed, we kept display bettas in well-structured tanks with floating logs, silk plants, and leaf hammocks. The difference in behavior and fin condition compared to the bettas in bare demo cups was visible within weeks. Better color, less fin clamping, more active movement through the tank. That is not anecdotal, we saw it consistently across multiple fish. Structure and rest spots matter more than any single enrichment toy.

Should You Buy Betta Enrichment Items?

Good fit if:
- Your betta is in a bare or minimally decorated tank and shows low activity or frequent glass-surfing
- You keep a single betta without tankmates and want to provide mental stimulation
- You are interested in training your betta or interacting with it during feeding
- You want to replicate more natural hiding and resting behavior
Skip if:
- Your betta is already in a well-planted tank with driftwood, caves, and floating plants, you likely do not need additional toy items
- You plan to add toys and then ignore them permanently (unused enrichment items become clutter and potential water quality issues)
- You want a mirror or training kit but won’t commit to 5 to 10 minutes of supervised interaction time
BUY OR SKIP?

Buy one or two items from this list, not all of them. The Zoo Med Floating Log and a leaf hammock cover the basics for most bettas. Add a ping pong ball if you want cheap interactive enrichment. Only add training kits and mirrors if you are going to actively use them, not just drop them in the tank and walk away.

Why They Need Enrichment

Betta fish, otherwise known as Siamese fighting fish, are naturally curious fish that need both physical and mental engagement to remain healthy and content. Betta fish get stressed and bored with nothing to interact with. I’ve seen bettas self-mutilate in barren setups, similar to what happens with captive birds that have no stimulation.

This is backed by research as well. A study by the University of Gothenburg in Sweden discusses the effect of environmental enrichment on captive fish:

We find that enrichment can affect several aspects of the biology of captive fish, for example, aggression, stress, energy expenditure, injury and disease susceptibility.

I can take this study and further link this to their natural habitats. In the wild, bettas live in shallow waters with a lot of vegetation, where they encounter various objects, plants, and other species. Males especially are constantly involved in chasing rivals away from their bubble nests. Stimulus is all around them.

To recreate these conditions at home, owners need access to living or silk plants that not only provide hiding spots but also resemble nature more accurately. Using items like ping pong balls and floating logs can provide entertainment during playtime, causing increased stimulation within the tank environment.

The 5 Best Betta Fish Toys

Let’s take a deep dive into the best betta fish toys so you can make an informed decision about what would work best in your betta’s tank. For all these toys I’m recommending, I’m looking at the following:
- The chances of your betta actually interacting with the toy
- The ease of use for the owner
- Quality of the toy and a reasonable price
All these toys should be easy for you to find online or at a local pet store. Let’s look at the first one.

1. Zoo Med Floating Log

Editor’s Choice

Zoo Med Floating Log

The floating log is an excellent environmental enhancer for your Betta fish. Offers a place to hide and rest at the top of their tank. Contains a feeding hole for ease of use

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The Zoo Med Floating Betta Log is my top recommendation on this entire list. It imitates the native habitat of bettas by providing a hollow floating structure where they can investigate, rest, or stay hidden near the surface. The feeding hole on top lets you drop food directly inside, which most bettas figure out quickly.

The suction cup occasionally lets go, which some keepers find annoying. I don’t. In nature, fallen logs drift. Low flow in a proper betta tank means the log moves gently and the betta follows it. Most bettas take to it within a day or two. It’s one of those items that works exactly as it should.

Specifications:
- Material: Durable, non-toxic resin
- Dimensions: 6.5 x 3.5 x 2.75 inches
Pros:
- Provides a natural-looking hiding spot
- Encourages exploration and relaxation
- Can double as a betta hammock
- Easy to install with a suction cup
Cons:
- May require additional suction cups for stability
- Paint has been known to chip off over time
MARK’S TOP PICK

The Zoo Med Floating Log is my first recommendation for any betta keeper without a heavily planted tank. It provides the near-surface hiding and resting space that bettas naturally seek, and most fish use it within 48 hours of it going in. If you only buy one item from this list, this is the one.

2. R2 Training Kit

R2 Training Kit

A great comprehensive kit that can be used to train your fish with a variety of tricks. Created by a father and son team!

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Want to teach your betta actual tricks and record them? This is the kit for that. Created by Dr. Dean Pomerlau and his son Kyle, this kit includes soccer balls and nets, a limbo bar, goal posts, tunnels, and hoops. Training works through positive reinforcement with a feeding wand.

One important caveat: not all bettas take to this equally. In my experience, Plakat bettas are active enough to engage with training kits. Fancy long-fin varieties like elephant ears struggle physically with some activities. Know your betta before investing in this kit.

Specifications:
- Training method: Positive reinforcement
- Includes: Hoops, balls, limbo poles, goal posts, feeding wand
Pros:
- Provides mental stimulation and interactive playtime
- Teaches betta fish tricks using positive reinforcement
- Includes various accessories for different training exercises
- Includes training lessons and instructions
Cons:
- Not suitable for all betta types or temperaments
- Requires dedicated time and effort to train fish
3. Zoo Med Exercise Mirror

Zoo Med Exercise Mirror

The exercise mirror by Zoo Med offers a way for your Betta to show it’s natural territorial behavior. Only use for short periods of time

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The Zoo Med Betta Exercise Mirror is a floating device that gives your betta a brief confrontation with its own reflection. The betta flares, displays natural territorial behavior, and gets both physical and mental engagement from a short session. This is legitimate enrichment when used correctly.

The hard rule here: never leave the mirror in the tank long-term. One to two minutes of mirror exposure is plenty, every other day at most. The goal is to mimic a natural encounter where a rival betta appears, the fish responds, and then the rival retreats. Remove the mirror after each session. A betta that cannot escape a perceived rival will show chronic stress. Clamped fins, faded color, reduced appetite. I have seen this in stores when mirrors were left in display tanks by accident.

Specifications:
- Type: Floating mirror
- Usage: Flaring aid for occasional enrichment only
Pros:
- Provides short-term stimulation and exercise
- Encourages natural territorial behaviors
- Easy to use and remove from the tank
Cons:
- Prolonged use causes stress and is harmful
4. CAVN Pen Light

CAVN Pen Light

This pen light is a high quality LED light that can be used as a pointer to train or to entertain fish

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This is not a fish toy in the traditional sense. It’s a medical penlight that hobbyists have repurposed for betta interaction. You can use the light point to direct a betta around the tank, train it to follow your finger, or get it positioned for photos. I have seen it used in aquascaping competitions to position schooling fish for shots, and the principle works with bettas too.

The interaction is engaging and costs almost nothing relative to dedicated toy kits. One firm rule: never point the light directly into the betta’s eye. Keep it on the glass or substrate and let the fish track it from outside the direct beam.

Specifications:
- Material: Plastic
- Color: White
- Size: 5.3 x 0.5 x 0.5 inches
- Weight: 0.32 ounces
Pros:
- Inexpensive
- Works for training and directing fish movement
- Compact and easy to use
Cons:
- Not specifically designed for betta fish enrichment
5. Zoo Med Leaf Hammock

Zoo Med Leaf Hammock

This Betta Hammock is a great alternative in the absence of live plants for your Betta to rest on

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Buy On Petco

The Zoo Med Leaf Hammock is more of a decoration than a toy, but it serves a real behavioral purpose. Bettas are labyrinth fish that breathe air from the surface. They rest near the top of the tank frequently. The leaf hammock gives them a stable platform to do that without expending energy constantly swimming.

Results vary by individual fish. Some bettas use it immediately. Others ignore it completely. If your betta has broad-leafed live plants or floating plants already, this product is largely redundant. For a minimally planted or bare tank, it’s a useful addition. I prefer recommending live plants when possible: Amazon swords, anubias, and floating plants like frogbit provide the same resting function with the added benefit of water quality improvement.

Specifications:
- Material: Soft plastic
- Attachment: Suction cup
Pros:
- Provides a comfortable resting place near the water’s surface
- Easy to install with a suction cup
- Blends well with aquarium decor
Cons:
- May require occasional adjustments for stability
- Not all bettas will use it
WHAT MOST PEOPLE MISS

The most overlooked betta enrichment option is also the cheapest: a ping pong ball. Drop a clean, new ping pong ball in a betta tank and watch what happens. Most bettas will push it around the surface, follow it, and interact with it more than many purpose-built toy products. It costs almost nothing, it’s safe, and bettas respond to it reliably. If you want a simple, low-effort enrichment add-on, start there before spending money on specialty products.

Bonus – A Ping Pong Ball

A ping pong ball is one of the cheapest and most effective enrichment options you can give a betta. Bettas push it around the surface, follow it, and interact with it more than many purpose-built products. If you have one at home, drop it in. Use a brand-new ball straight from the package so there are no contaminants. Bettas can even be trained to push it into a goal with the R2 training kit. Simple, free, and it works.

Choosing The Right One

When selecting enrichment for a betta, prioritize items that match their natural behaviors: hiding, resting near the surface, exploring, and occasional territorial display. All items should be aquarium-safe with no sharp edges or toxic materials. With the exception of a ping pong ball, stay away from items not designed for aquarium use.

One practical consideration: know what type of betta you have. Plakat bettas are active and physically capable of training kits and active interaction. Long-fin fancy varieties like halfmoons and elephant ears have heavier fins that limit their physical range. They benefit more from resting structures like the floating log and leaf hammock than from active training setups.

Non-Toy Ideas

Toys are nice, but natural environmental enhancers are better in the long run. Here are a few non-toy options worth considering.

Indian Almond Leaves

Indian Almond Leaves

These leaves can be added to your aquarium to help promote a natural habitat for bettas, shrimp, and other soft-water loving fish. Betta breeders can use these leaves to help encourage breeding behavior.

Click For Best Price

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Indian Almond leaves (also called catappa) release tannins into the water, softening it and adding antibacterial and antifungal properties. Bettas in tannin-rich water rest on the leaves, behave more naturally, and show better color over time. These leaves were historically used by betta fighters to help injured fish heal faster. They are not a toy but genuine environmental enrichment that improves conditions at the same time.

Moss Balls

Budget Option

Marimo Moss Ball

Budget Option

A cheap and easy to care for aquarium plant. Thrives in low light and very low maintenance

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Bettas are genuinely curious about Marimo Moss balls. Adding one or two to the tank sparks investigation and gives them something to nudge and explore. They also absorb nitrates and remove toxins from the water, which makes them double-duty enrichment. Inexpensive, low maintenance, and effective in small tanks.

Tankmates

The best long-term enrichment for a betta is appropriate tankmates in a large enough tank. Bettas interact with other fish, monitor territory, and generally show more natural behavior in a community setup. You need at least a 10-gallon tank to add tankmates, and species selection matters. Avoid anything that looks like a betta, anything with long flowing fins that a betta might nip, and anything fast or aggressive enough to stress the betta out. Good options include:
- Corydoras Catfish
- Bamboo Shrimp
- Mystery Snail
- Rummy Nose Tetras
Frequently Asked Questions

Do betta fish use toys?

Bettas are curious fish and will interact with a variety of enrichment items. Ping pong balls, floating logs, and mirrors all trigger different natural behaviors. The key is matching the enrichment type to what your specific betta actually responds to, since individual fish vary in personality and activity level.

How do you keep a betta entertained?

The most effective long-term enrichment is a well-structured environment: a floating log or caves near the surface, live or silk plants for cover, and Indian almond leaves for water enrichment. Adding appropriate tankmates in a 10-gallon or larger tank provides ongoing natural interaction. Toys like ping pong balls and brief mirror sessions supplement the baseline but don’t replace good tank setup.

How often should I use the Zoo Med Betta Exercise Mirror?

Use the mirror for one to two minutes every other day at most. Remove it immediately after each session. Never leave it in the tank permanently. Overuse causes chronic stress rather than enrichment. Think of it as an occasional exercise session, not a permanent fixture.

Are there any alternatives to betta fish toys?

Live plants, driftwood, floating plants, and Indian almond leaves all provide enrichment without the limitations of plastic toys. In most cases, a well-planted tank provides more ongoing enrichment than any toy product. For interaction, dedicating a few minutes of feeding-time engagement is more valuable than leaving toys in the tank and walking away.

What should I avoid when choosing betta fish toys?

Avoid anything with sharp edges, rough interior surfaces, or materials not designed for aquarium use. Avoid leaving mirrors or high-stimulation items in the tank long-term. Avoid over-stimulation from constant rearranging of tank decor. Bettas establish territory and disrupting that repeatedly causes stress rather than enrichment.

Closing Thoughts

Enrichment for bettas is not about buying the most products. It’s about giving the fish structure, variety, and the occasional controlled interaction. The Zoo Med Floating Log is the foundation. A ping pong ball gives you free interactive enrichment. Indian almond leaves improve the environment while providing something to rest on. Brief mirror sessions once every couple of days add behavioral stimulation without the stress risk of permanent exposure.

Get those basics right and your betta will be more active, show better color, and hold up far longer than one in a bare tank with no stimulation. The difference is real and it shows up over months, not days.

For quality betta supplies and live fish, Flip Aquatics and Dan’s Fish are both reputable sources worth checking out for bettas and compatible tankmates.

📘 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.
October 8, 2023
Do Betta Fish Need a Filter? My Honest Answer and What I Actually Use
I get this email or message a lot through my email or YouTube channel. Hobbyists, usually brand new, often tell me about their betta fish and their issues. Often, it stems from poor conditions or a question that all centers around the topic of this blog post.

My quick answer to this is no – they don’t need one. However, many hobbyists are not able to run a tank filterless nor have the desire to maintain a tank without a filter. Not to mention, many filterless tanks are small and lack other factors that are a must for a Betta, such as a heater.

My go-to recommendations are a sponge filter or an HOB with a sponge pre-filter on the intake. That last part matters. bettas are notoriously weak swimmers (the exception being plakat bettas, which have shorter fins and handle flow much better), and a strong current or an unprotected intake can stress or trap them.
Key Takeaways
- Betta fish can survive and even thrive without a filter but requires a lot of understanding of advanced methods of natural fishkeeping.
- Consider factors such as tank size, adjustability, and maintenance needs when selecting the right filter for your betta fish.
- Going without a filter requires extra precautions to ensure the cleanliness and stability of the water. It may come with increased risks that should be carefully considered.
Understanding Their Natural Environment

Before we discuss filters, we need to first understand how Bettas live naturally. Bettas naturally live in shallow waters and rarely swim more than 4-5 feet away from their territories throughout their entire lives¹.

Knowing this, one may assume that it’s perfectly okay to place these fish in a tiny container and have no filter, considering they live in low oxygen environments. However, there are many things we need to consider here:
- While the territory and swim space are small naturally for a Betta, the availability of shelter is high, with driftwood, plants, and other matter in the water providing excellent cover for them
- Plants, natural bacteria in the tank and soil will care for many of the nutrient issues in the wild
- Bettas thrive in tannin rich waters in the wild, which requires specific setups in captivity
- Nutrient levels are fairly low in native environments for Betta – oxygen is the main lacking factor
In my experience being in this hobby for over 25 years, the vast majority of new aquarium hobbyists lack the desire to keep a natural fish tank (though I will discuss how near the end of this post). In the absence of keeping a natural fish tank, filters are something we must consider in order to maintain stable parameters for our beloved Bettas.

Why We Need Them

When it comes to betta fish care, maintaining a healthy tank environment is essential and filters play an integral role. They are instrumental in eliminating waste from the tank water, enhancing oxygenation, and stimulating the growth of beneficial bacteria for improved water quality. Adding a filter to your betta aquarium can result in several advantages, such as enabling you to have other tropical species living with them while also keeping toxic parameter levels undetectable.

It’s important to remember that these particular fish come originally from shallow rice paddies, which provide slow-moving waters unlike what many other types of tropicals prefer. So selecting the right type of filtering device could make all the difference here – one like air pump powered sponge filters would work best due to its gentleness on both flow rate and ability to filter.

Waste Removal And Water Quality

To ensure proper water quality and waste removal for betta fish, it is important to incorporate a filter into their tank. This can be accomplished with the help of mechanical filtration, which traps particles using various types of media like filter pads, sponges, or gravel (as in the case with under gravel filters).

In combination with mechanical filtration, chemical processes such as activated carbon treatment also support healthy levels by removing substances such as toxins or medications from the environment itself.

Finally, when using a filter specifically made for betta fish’s requirements, you should always practice safe handling practices – making sure filter floss/media replacements occur according to manufacturer instructions and that regular general upkeep takes place on time so toxins don’t leech back in. Consider changing your media sooner if you have an overstocked tank.

Oxygenation And Bacteria Growth

Betta tanks should be kept clean, and filters like sponge filters can help with this process by promoting the growth of bacteria beneficial for biological filtration. This type of bacteria breaks down fish waste via a procedure called the nitrogen cycle into less hazardous substances such as ammonia or nitrites to keep your betta’s habitat safe. It is also important that water flow in their tank doesn’t become static since it prevents air bubbles from forming, which leads to depletion of oxygen levels, something crucial due to betta fishes’ own labyrinth organ not being enough on its own.

Do Betta Fish Need A Filter?

While a Betta fish can live without a filter in the right environment (more on this later), most setups will require a filter for your fish to thrive and maintain good health. Without one, ammonia and nitrite levels can spike, which may lead to stress or even death for these aquatic pets.

Regular water changes as well as tank cleaning, become essential in the absence of a filter due to potentially poor water quality that comes with not having a filter, resulting in stress, sickness, or shorter lifespans for betta fish. Going without a filtration system may seem like an easier option, but this choice exposes your pet fish to more environmental threats than providing them would have been initially thought out.

Filters are highly necessary if you wish to create optimal conditions for your beloved betta. Going without filters usually will require more maintenance care as I describe below.

Increased Maintenance Requirements

Without the aid of a filter, extra work is essential for keeping your betta fish tank clean and healthy. To make sure the water stays ideal for these creatures, it’s necessary to perform frequent changes. With an unfiltered tank in a small container, it is pretty uncommon to change water every 2-3 days.

Manual cleaning must be done on a regular basis in order to dispose of any waste that might lead to adverse effects if left unaddressed.

It can take some time and effort when maintaining an aquarium without using filters. One should consider carefully before deciding between benefits that come with having such equipment versus the increased demand put onto them due to additional upkeep they need do achieve optimal conditions within their betta fish tank.

Potential Health Risks

Having a filtered tank is the best choice for your betta fish to ensure their longevity and health. Without filtration, accumulated ammonia from waste can become toxic in an unfiltered environment, leading to stress as well as illnesses such as fin rot or ich. Exposure to poor water quality due to no filter can reduce the life span of bettas significantly.

By providing adequate filtration, you help remove toxins like ammonia and nitrites. This greatly improve the general health condition of your pet by reducing potential harm caused by bad water chemistry values too high in pollutants that could lead to harmful diseases.

Pros And Cons Of Going Filterless

What are the benefits and drawbacks? As a quick breakdown, here they are:

Cons:
- Increased water changes
- Less tank stability to manage toxic ammonia and nitrites
Here are the pros:
- Saves money
- No need to maintain equipment
Filtration Methods

When it comes to providing a healthy home for your betta fish, there are three filtration methods you should consider: mechanical, biological, and chemical. Each targets different areas of water cleanliness in order to make sure that the environment is safe and suitable for them. Using all three simultaneously can provide optimal results when implemented correctly into your tank setup.

Every aquarium filter outside of a sponge filter has a 3 stage filtration feature, and it is typically what I recommend with my 25 years of experience in the hobby.

Mechanical filters work by filtering out solid debris or waste from the aquarium while beneficial bacteria grow with use of biological filtration, which helps break down any dangerous elements within the habitat, such as harmful chemicals, so they cannot cause harm. Chemical media like activated carbon on its own works too – trapping toxins in order to keep overall water quality balanced inside your betta’s tank system.

Mechanical Filtration

We discussed mechanical filtration earlier in this post and now we can dive into it more in this section. Mechancial filter works by trapping debris from the water column with pads, floss, or sponges. It is important to note that this mechanical filtration is not effective unless you clean or replace the mechanical filtration regularly. The debris will continue to stay in the tank trapped and will continue to break down into harmful substances like ammonia until you clean it out.

Some filters, like Marineland and Tetra filters, will have a cartridge system that will combine both mechanical and chemical filtration. While this seems convenient at first, long term, it can be expensive. I recommend going with a filter that has separate mechanical and chemical filtration sections.

Chemical Filtration

Chemical filtration is one of the most controversial filtration methods that you will often see talked about on forums and discussion groups. I have mixed beliefs on it and believe that it has it’s place for many applications.

Chemical filtration is designed to absorb harmful chemicals and remove odor and discoloration in the tank. On the surface, this shows great; however, in some circumstances, it’s not the best.

For example, if you have a heavily planted tank carbon can remove trace elements and may require you to change water or fertilize more often. It will also remove medications used so it should be used in a hospital tank.

Carbon also doesn’t last forever. Usually, 3-4 weeks is the average lifespan before you will need to replace it. Use carbon when you want to :
- Remove odors
- If you desire a clear looking tank
- If you concerned about outside environmental factors around your tank, like sprays getting into the tank
Avoid carbon if:
- You need to medicate a tank
- Have a heavily planted tank and running with infrequent water changes
- Want to run a tannin heavy tank
When keeping betta fish, I believe it’s beneficial to run carbon for them as tanks are small, and it helps keep the tank fresh and clear looking.

Biological Filtration

Biological filter media is an important aspect in making sure betta fish live in a good environment. Beneficial bacteria, that can breakdown toxins like ammonia and nitrites through the nitrogen cycle process are enabled to grow due to the surface media provided in biological chambers of filters. This means your aquarium’s water quality will be kept clean for your finned friend.

Biological filtration cannot do all of the work on its own when it comes to ensuring top tier conditions for keeping them happy and healthy. Both mechanical and chemical methods need to merge together with this solution so that you can establish the best tank conditions possible for your fish!

Types Suitable

When setting up a betta tank, it is essential to choose the right filter for your particular needs. Hang-on-back (HOB), internal aquarium, sponge and canister filters are all viable options that come with their own pros and cons.

Before making an informed decision on which type of filtration would be best suited to provide your betta fish’s unique environment with adequate filtration, water flow as well as overall maintenance requirements. Keep in mind that they require peaceful aquatic conditions without strong currents or high levels of agitation from powerful pumps/filters etc.

By understanding the various types available for use in betta tanks, we can create safe environments where our beloved pets will thrive happily while being provided maximum health benefits from proper filtering systems that suit their individual habits & lifestyles perfectly!

Hang-On-Back (HOB)

HOB filters (AKA power filters) are a great choice for betta tanks because of their practicality, convenience and efficiency. These kinds of filters offer several benefits: they hang on the outside wall or back side of your aquarium so that it doesn’t take up extra space inside, installing them is simple enough to do as well as maintain, chemical filtrations paired with mechanical ones makes these types effective at eliminating impurities from water. Adjustable flow rates can be set according to whatever suits best for the particular fish species in question such as betta fishes.

Don’t forget that regular maintenance plus replacing cartridges regularly will ensure that HOB filter functions properly all through its lifetime usage time. It’s significant, though, to look out and make sure there won’t create strong currents which may likely cause harm or stress out any type of aquatic creature, including our beloved betta fishes. if this happens, try making some changes by covering the intake valve via an aquarium sponge in order reduce output pressure coming from Filters themselves accordingly.

A HOB filter should have a sponge put on the intake to prevent your fish from being sucked into the filter. Consider also setting your filter to one of the lower settings to keep the water calm.

Sponge Filters

Betta fish tanks require gentle filtration, and that’s why sponge filters are the perfect choice for them. These aquarium filters can provide both mechanical as well biological filtering, which is suitable even in breeding or quarantine habitats of betta fishes.

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Though effective with smaller tanks, when it comes to bigger ones with multiple inhabitants, these may not offer adequate filtration. Some sponge filters can offer chemical media sections, though I would consider another filter type instead of purchasing these.

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Hikari Bacto Surge Sponge Filter

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To ensure its proper functioning, you’ll need to rinse the filter sponges weekly or bi weekly by using water from within the tank itself. Sponge filters are a great option because they won’t suck up your fish and will keep a calm current in the tank.

Internal Filters

When looking for an internal filter for betta tanks, it is important to consider the tank size and capacity of the filter. These filters attach to the sides using suction cups and provide a combination of mechanical filtration and biological surface area. Though they offer many benefits in terms of versatility, their use may take up valuable space within your aquariums that need more frequent cleaning than other types do. I personally do not use internal filters that often in tanks that I have setup in the past. If I did, the only internal filter I would use would be OASE’s since I can place a heater inside of it.

Editor’s Choice

OASE Bioplus Thermo

The Best Internal Filter
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Canisters

Canister filters are well suited for larger betta tanks or planted tanks, as they have the capacity to deal with a higher volume of water while providing thorough filtration. This type of filter is placed outside the aquarium and works by pumping water into it which then passes through its filtering media. Though efficient in managing high quality water parameters, canister filters come at an extra cost with more maintenance required than other types of filters.

The other issue that I have seen happen is that canister filters are designed for higher output than other filters. I have seen Betta’s get sucked up by the intakes as a result or get stressed by the water flow in the tank. You can resolve the intake issue with a sponge on the intake and you can resolve the flow by lowering the flow and using a spray outlet to defuse the flow.

Choosing The Right One

Choosing the right filter for your betta tank is important to keep your fish healthy and content. The size of the tank, ease of maintenance, flow rate adjustment options should all be considered when selecting a filter. If possible opt out in favor of one that allows you to maintain proper water quality while avoiding strong currents which may stress out or even hurt the betta fish.

The frequency with which filters need cleaning as well as their cartridge replacement requirements, have to taken into account too. Ultimately though it’s vital that whatever decision is made accounts for its impact on providing an optimal environment specifically tailored towards keeping these creatures happy and alive for years!

Adjustability And Flow Rate

When planning the home of your betta fish, having a filter with adjustable water flow rates is essential. High-velocity currents generated by fixed speed filters can be damaging to these creatures and cause health problems that may reduce their lifespan. To guarantee they will live long and happily, you must equip their tank with a device which allows for adjustments in order to create an environment suitable for them. slow flowing waters being ideal.

The most common mistake I see with betta filtration is running a filter that’s too strong. Most bettas are weak swimmers. they’ll spend all their energy fighting the current rather than exploring the tank. If your betta is constantly hiding in corners, the flow is probably the problem. The exception is plakat bettas, which have shorter fins and handle stronger flow much better than a standard veiltail.

Maintenance And Replacement Requirements

When deciding on the filter for your betta tank, keep in mind that different types require varying levels of care and maintenance. This could involve frequent cleaning or changing cartridges, which may be demanding to carry out regularly. Consider if you will have enough time available for these upkeep requirements when selecting a filter before installing it in the aquarium. Generally, the more advanced the filter, the more maintenance it will require to keep running.

Going The Filterless Route

Yes, you can run a Betta tank without an aquarium filter. However, it’s not easy. It requires a very specific setup and knowledge of how to grow and keep live aquarium plants. Here is how we do it:

In a heavily planted natural tank, this is absolutely doable. I’ve seen it work well firsthand. When you have enough plant mass doing the biological work, the filter becomes optional. It takes more knowledge to manage, but for an experienced keeper it’s a legitimate approach.
- We will need an active substrate that will serve as a beneficial bacteria bed for our tank
- We will need to acquire easy to care for, fast growing, plants that can overwhelm algae growth
- You will want to have a heavily planted tank. Light planting will not be enough
- We will need to understand fertilizers and dose our aquarium – especially if we don’t plan on changing water
Walstad Method

In order to do this correctly, you will need to understand the principles of running a natural tank. The most well known method for a natural tank is known as the Walstad Method. This involves setting up a heavily planted tank using organic potting soil and capping it with a 1″ layer of sand.

I will do an article on the Walstad Method, breaking it down further in the future. Here are some plants that are great candidates:
- Java Fern
- Horn w ort
- Bucephalandra
- Water Lettuce
- Bacopa
The betta fish is the perfect fish to have for a natural based tank so you are in luck. With their hardy nature and ability to breathe air outside of the tank they adapt well to a no filter environment.

The Father Fish Method

Another route to try is what is now called the Father Fish Method. Father Fish is an aquarium influencer with over 50 years in the hobby and a big believer in natural aquariums. He utilizes a modified Walstad Method that improved on the deficiencies of the Walstad. Definitely give him a follow on YouTube if you want to learn more about his approach. I am admittingly a more traditional aquarium keeper like my peers Cory and GreenAqua. However, Father Fish is a great resource of information and provides some hard hitting truths and mythbusting.

Although some may assume this option is cheaper and takes less work, there are potential problems such as stress induced illnesses and death if you mess up the setup. This is why I advocate research if you are going the no filter route.

One con to both of these methods is that the aesthetics of the tank bottom can be unsightly for some. More traditional aquascapes favor a more aesthetically pleasing presentation over the natural tank setup. If you don’t want to deal with the hassle of setup or want the aesthetics, consider doing a hybrid with a filter and hardy plants that are column feeders or going all in with carpet plants in a larger aquascape setup.

Frequently Asked Questions

How long can betta fish go without a filter?

Betta fish can live without a filter as long as the ammonia and nitrite levels stay undetectable or low. Assuming that this isn’t the case, most bettas will tolerate the high concentrates for about a week or two until they are overwhelmed by ammonia or nitrate posing. This is why I stated earlier that aquariums without a filter or plants need to be changed every 3-4 days too keep levels liveable.

Do betta fish need a filter and air pump?

When it comes to a betta aquarium, a filter is usually necessary – an air pump though isn’t necessarily so. It can be beneficial without one present in the tank. Having one is not required. You actually get both with a sponge filter (otherwise known as an air pump filter).

Do betta fish need anything in their water?

Betta fish need tap water that has been filtered to remove chlorine and other metals. Betta need trace elements in their water for survival so using pure distilled water should be avoided as it doesn’t contain these elements

What does a betta need in a tank?

Bettas require a filter, heater and a 5 gallon tank to thrive. 10 gallons is the ideal size if you are considering other tankmates. The setup should be in an area without too much foot traffic away from direct sunlight or drafts close by a power source. Some decor is required, either silk based or live. Driftwood can be used, but sharp edges need to be sanded down.

What types of filters are suitable for betta fish tanks?

HOB, internal aquarium, sponge, and canister filters are all excellent choices for betta fish tanks. These provide a great way to keep the environment safe and healthy so that your beloved betta has an enjoyable home. As long as the intake is covered with a sponge and the flow is modified to suit the betta, you should be good to go.

Closing Thoughts

For your betta’s optimum health, it is essential to keep their environment clean and healthy. A filter plays an important role in sustaining water quality as well as fostering the growth of beneficial bacteria for a thriving habitat. While they can exist without one, it carries greater demands when caring for them, possibly putting their longevity at risk.

Now I know several of my readers will want to debate me on this topic and I’m completely open to it. Have you keep your betta without a filter? Let me know in the comments below and let’s discuss. This is one of the more debated topics on the internet and I’m happy to debate and learn from you.

📘 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 Aquarium Equipment & Gear Guide. your ultimate resource for filters, heaters, lights, pumps, tanks, and more.
October 4, 2023
Is My Betta Fish Dying? 5 Signs to Watch For (And What to Do)
In 25 years of keeping and selling fish, the first thing I check when a betta looks off is whether it’s still eating. A betta that stops eating is the earliest and most reliable warning sign that something is wrong. often showing up before lethargy, color loss, or anything else you can easily see. Here’s what I’ve learned to watch for, what causes early betta deaths most often, and honest advice on what to do if you think your fish is in trouble.
Key Takeaways
- Bettas have the ability to live for 5 years or more in an aquarium with proper care and maintenance.
- A sick betta fish will show signs of lethargy, heavy breathing, and fading color.
- A dying or dead betta fish will be difficult to find in the aquarium. Once found, they might be ghostly white and stiff.
- There are many ways to prevent a betta fish from becoming sick in the first place, but it’s important to be prepared for health issues and water problems before they happen.
The Reason Why They Are Short Lived

Betta fish aren’t usually treated like other tropical fish species. They’re often pushed into too small tanks with poor water quality and an overall improper setup. Bettas are beautiful fish that will thrive and live for a considerable amount of time in the right aquarium.

I cannot count the number of times I’ve seen new hobbyists with get a betta and stick them in a bowl or a “starter tank” that is smaller than 5 gallons, often with no heater¹. It’s understandable why this misconception is made as it’s typical to see these fish in cups at chain fish stores. I’m hoping after reading his article you will see there are many ways to increase their lifespans and general health by learning more about their needs.

How Long Are They Supposed To Live?

Popular thought is that betta fish only live above 2 to 3 years. While this might be the average hobbyist experience, betta fish can actually live closer to 5 years.

There are a few reasons why there is a gap between popular belief and their actual life span. One of the major considerations that needs to be taken is the initial age at which the betta is purchased.

More than likely, your pet betta fish will already be a couple of years old once you add it to your tank. That means that, on average, you will only have another couple of years left with it. This leaves many hobbyists with the impression that betta fish live shorter than other fish.

However, if you find that your betta fish is dying after a few short months of having it, then there’s most likely a problem in your tank or with the fish. Some of these reasons include water quality, disease, and stress.

But if nothing seems outwardly wrong with the fish, how can you tell that it’s dying?

Is My Betta Fish Dying (5 Signs)

Unless something wrong happens very fast, fish will often give signs that their health is declining. Here are some of the signs that your betta is dying, along with the reasons they might be displaying these symptoms.

The most important thing to watch day-to-day is whether your betta is still eating. In my experience, a betta refusing food is the very first warning that something is wrong. it often appears before any of the 5 signs below become obvious. If your betta skips a meal, don’t panic, but watch closely over the next 24. 48 hours.

1. Lethargy

The most common sign of a dying betta fish is lethargy. Betta fish aren’t the most active fish to start with, but a lack of activity can quickly become a concerning behavior.

Common betta fish behaviors include occasionally swimming around the tank, coming to the top of the tank for fish food, and inspecting new items that enter the aquarium. However, normal behaviors can also include laying on their side, floating to the bottom of the aquarium, and resting on objects and plants in the aquarium.

How can you tell the difference between a resting or sleeping healthy fish and one that’s floating unnaturally?

A healthy betta fish will regularly take breaks and rest on a leaf or at the bottom of the substrate. In fact, some bettas sleep so heavily that their owners think they’re dead!

Problems arise when your betta fish wants to be doing something else but is too weak to move or swim. Along with laying on the substrate or an object, your fish might be discolored, breathing abnormally, or with tattered fins. There are common symptoms of many aquarium fish diseases, like ich, swim bladder disease, or dropsy. An older betta fish might also struggle to swim around the aquarium as they once did.

2. Slowed Reactions

Alongside lethargy might be slowed reactions. While your betta fish might still be able to move around the tank (albeit at their own pace), they might be slow to react to food or other stimuli.

In most cases, slowed reactions are a result of old age. As eyesight, smell, and mobility decrease, your fish might need some help.

While eyesight decline or even blindness does happen with elderly fish. Fish can live normal lives without their site. I have had to build routines so that my blind bettas could continue to eat and swim safely in the tank. Check my article on Dragon Bettas as I drive into that subject as these fancy betta do experience a blindness condition known as diamond eye and I discuss these routines that help.

However, if your fish is showing little to no interest in food or other things they once enjoyed doing, then there might be an underlying cause. This is especially concerning if your betta fish loses its appetite. Loss of appetite is a very common symptom of most aquarium diseases. A compromised fish may continue to become sicker if they don’t get the nutrients they need to recover.

3. Heavy Breathing

Heavy breathing is a sure sign that something is wrong with your betta fish. And sadly, once a fish starts to breathe rapidly, there is often little time to act.

Often seen alongside lethargy, rapid breathing can be noticed as a fast movement in the gills and mouth. In most cases, this is due to issues with water parameters, but can also be due to disease and illness. It is uncommon for an old betta fish to show signs of heavy breathing.

There is no other reason why a fish might be showing signs of heavy breathing. Even swimming quickly in the aquarium is unlikely to leave your betta gasping for air. As mentioned before, this symptom is one of the last seen in a betta fish that is dying.

4. Fading Color

The good news is that fading color is one of the least alarming betta fish symptoms on this list as it can be caused by a magnitude of other factors, some of which are easily fixable.

The main reason why betta fish lose color is due to stress. Most often, bettas lose color during transfer and acclimation. Stress is why your betta fish gains so much color in the first week of having it as opposed to its washed-out appearance at the pet store.

Other stress factors, like incompatible tank mates, can also cause your betta fish to lose color. If keeping a female betta, then she might even develop dark lines across her body that are known as stress stripes.

Stress factors may not be the only reason your fish loses color, though. Loss of color is a common side effect of most aquarium illnesses, especially fin rot, which is one of the most common betta fish ailments.

Another reason your fish might be losing color is due to an improper diet. Though this change in appearance won’t be as significant as that of a sick or dying betta fish, intensity and vibrancy can definitely suffer if not given quality food. In addition to a high-quality protein-based diet, betta fish should also be given a variety of live, frozen, and freeze-dried options, like brine shrimp, mysis shrimp, and bloodworms.

5. Disfigurement

Another obvious change in appearance that could lead to death might be disfigurement. This is especially noticeable in betta fish suffering from dropsy, swim bladder disease, or tuberculosis (fish TB).

Unfortunately, most cases of disfigurement are permanent and lead to decreased quality of life or death. There are several rare cases of betta fish owners intervening and creating devices to help their handicapped fish once all other problems have been fixed.

However, I have typically seen these devices used for Fancy Goldfish as their bulk allows for them to be placed in swim bladder wheelchairs. These wheelchairs allow them to swim properly. Bettas, unfortunately, are too thin to be housed in these devices.

Reasons For An Early Death

As mentioned before, betta fish should live for at least 2 years with most having the potential to live up to 5 in their permanent home. There is no reason why you should experience your betta fish dying after just a couple of weeks of owning them.

If you experienced a very premature betta fish death, then disease, water quality, stress, or other factors were most likely the cause.

Disease

One of the main reasons why betta fish die is due to disease. Unfortunately, disease is rampant in the aquarium hobby, and betta fish are especially susceptible due to less-than-ideal housing conditions in commercial pet stores.

Whenever bringing a fish home from the pet store, it is safe to assume that the fish has been exposed to a disease or illness. Because of this, most hobbyists quarantine their fish before adding them to their main aquarium. As betta fish are often kept alone, this is usually unnecessary, though a quarantine system makes dosing medications and controlling water conditions much easier.

If your betta fish develops disease after adding it to your tank or if new tank mates bring in disease to a mature system, then all contaminated fish need to be treated.

Quickly diagnose the disease and start treatment. Luckily, betta fish are resilient fish that often bounce back with the correct treatment.

Water Quality

Poor water quality is also one of the major reasons why betta fish die prematurely.

As betta fish are seen as beginner fish, many fishkeepers new to the hobby are not fully aware of the importance of water parameters. This, in addition to betta fish being seen as hardy fish that don’t need much to survive, often leads to an early betta fish death. The #1 reason for early death is beginners will place these fish in bowls without a filter.

Like other fish, betta fish need a fully cycled aquarium with 0 ppm ammonia, 0 ppm nitrite, and low to moderate nitrates. Water temperature must be stable between 78-80° F with pH relatively neutral at 7.0.

Sadly, some inexperienced hobbyists are not aware that their betta fish is a tropical species. This can lead to overly cold, hot, or unstable water temperature conditions. A cold betta will quickly become lethargic while a hot betta may become erratic and breathe heavily. Some of the deadliest betta diseases are caused by incorrect temperatures. A heater is a must with a betta.

At the same time, incorrectly treated water can also cause a sick fish. Luckily, most pet stores sell water conditioners along with a new fish. This is an easy way to remove otherwise deadly chemicals, like chlorine, from the water. A betta fish exposed to chlorine may sink to the bottom of the tank and start to breathe rapidly.

My Pick

Seachem Prime

Seachem prime is a easy to use and affordable choice when it comes to remove chlorine and chloramines from your tap water. Highly recommended!

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My Personal Story On Water Quality And Early Deaths

I have a sad story to share about one of my friends I knew who lived in Austin. She got a Betta fish and was new to the hobby. Everything was going great for the first few months, until one day, when she was cleaning the tank, she forgot to put the water conditioner into the new tank water. She went out of town, and I called a friend of mine to check in on the tank after finding out about it.

The fish was in a 5 gallon tank, and within a couple of hours, the fish had passed away. It’s that quick if you don’t treat your water!

The cause was straightforward but devastating: she had done a water change without using a dechlorinator. The chlorine in Austin tap water was immediately toxic to the fish. It’s one of the most preventable betta deaths I’ve seen. a reminder that always treating tap water before it touches your tank isn’t optional.

Stress

Normal betta fish behavior is relaxed swimming with an inquisitive nature. If your fish starts swimming erratically, becomes uninterested in its surroundings, or changes in physical appearance, then it is most likely stressed.

Stress can arise from a number of factors, including tank conditions, tank mates, and disease.

Some of the common causes of environmental betta stress come from poor water quality and tank size. These poor fish have been pushed into small tanks for decades. It wasn’t until recently that the aquarium fish industry started advocating for keeping betta fish in correctly sized aquariums that are at least 5 gallons. Otherwise, a small aquarium can lead to sick fish due to poor water conditions or an overall lack of enrichment.

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Very active fish or aggressive tank mates can also cause a betta to become stressed. While most betta fish are kept alone, some hobbyists try introducing supposedly compatible species. While these species might work in some setups, a lot depends on the tank setup and the individual betta. Sometimes, it just doesn’t work, and the betta is left stressed.

Lastly, health issues can greatly stress out a betta. Possible pain and discomfort can bring additional agony to bettas, while the change of scenery and conditions in a hospital tank can bring temporary stress. In most cases, the temporary stress from treatment is often worth the recovery.

Other Factors

In some cases, there’s no way to know that your betta fish is dying. Sometimes, conditions change so quickly that there is no saving your fish.

Some of these factors include changes in source water, introduction of outside chemicals, tank leaks, and aquarium hoods.

Source water is everything for aquariums. Healthy tank water is the best way to keep your fish healthy. But what happens when your tank isn’t healthy, and you have no way of knowing?

This can happen if you use tap water or well water in your betta aquarium. While these tank water sources can largely be trusted, sometimes unknowns happen, and contaminants enter the system. Unannounced to betta owners, these unknowns can be deadly for fish. The worst part is that you may never know what went wrong without ordering an in-depth water analysis.

Likewise, common household chemicals may also lead to sick betta fish. This happens when using aerosol cans, which can readily deliver toxins into the aquarium. For this reason, it’s strongly advised to keep all potential chemicals far away from the aquarium and to open windows when using spray chemicals.

Another unexpected death could be due to a tank leak. While this is more unlikely to happen in smaller aquariums, sometimes tanks burst a leak in the middle of the night. You may find your betta fish struggling to breathe in whatever pockets of water remain in the tank the next morning.

Lastly, you may find your betta fish dead on the floor the next time you go to check on your fish. Even with an aquarium hood, bettas are excellent jumpers that can easily fit through a small open crack. This jump may be unprovoked or the result of stress. Regardless, the result is the same, and you end up with a dead or dying betta.

Confirming Your Fish Has Passed

It’s one thing to question whether or not your betta fish is dying, but it can be somewhat challenging to make sure your fish is actually dead.

If your betta is clearly suffering and beyond recovery, you can end its life humanely using clove oil. A small amount mixed into tank water acts as an anesthetic and then peacefully stops the heart. It’s not an easy decision, but it’s far kinder than watching a fish struggle for days.

If you’ve been monitoring your betta fish closely for a few days, then it can be very alarming to not find it swimming out front when the tank lights turn on. Prepare for the worst and start searching the tank. Check in between plants and under decorations. Look at equipment and other suction areas. More than likely, you’ll find a very sick fish or a dead fish.

A dead betta will lack color, have dilated eyes, and be motionless or stiff. If a cleanup crew is present in the aquarium, they may have already started to break down the body. At this point, the fish can be removed from the aquarium and disposed of.

Remember that your aquarium may still be infected if the fish suffered from viral, parasitic, or bacterial infections.

FAQs

How do you save a dying betta fish?

The best way to save a dying betta is by identifying what it’s dying from. Immediately check the betta fish’s body for signs of disease and then test the water parameters. Treat accordingly but not hastily as aggressive treatment could lead to a premature death.

What does a sick betta look like?

A sick betta may lack color and have its fins folded. They may also exhibit unusual behaviors like lethargy and trouble breathing. If left untreated, new symptoms will continue to appear and worsen as time passes.

Do betta fish float or sink when they die?

Everyone has seen a cartoon of a dead fish with X’s over its eyes. Contrary to popular belief, though, betta fish sink when they die. They are often carried along with the current once they have passed and get lodged into a hard-to-reach space in the tank.

How do you treat a sick betta fish?

There are many ways to treat a sick betta fish. As said before, the best treatment is first finding out what’s the problem. Courses of treatment can include a water change, dosing medications, or comforting an old fish in its final days.

How do you know when a betta fish is going to die?

Betta fish death is sudden but gradual. These fish often show signs of dying over the course of a few days or a couple of weeks. Common signs of decline include lack of appetite, loss of color and vibrancy, as well as hiding and laying on the substrate.

What is the most common way betta fish die?

The most common ways bettas die are due to diseases and poor water quality. With good aquarium husbandry, both of these ways can largely be avoided.

Conclusion

You can never be prepared to lose a pet, but you can always be prepared to treat a sick pet. The best way to keep a betta fish from dying is to prevent it from getting sick in the first place. Be familiar with the common signs of disease and poor water quality and purchase fish from reputable sources. However, sometimes fish die of old age and unknown causes that could have never been foreseen.

📘 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.
October 3, 2023

Crystal Red Shrimp Care Guide: What You Need to Know Before You Buy

Crystal Red Shrimp need acidic, soft water with zero ammonia tolerance. They are not beginner shrimp. One parameter swing and you lose half the colony overnight.

If you cannot maintain a pH of 6.0 to 6.8 with zero ammonia every single day, CRS are not for you.

What It Is Actually Like Living With Crystal Red Shrimp

A shrimp tank is a constant show of activity. Shrimp graze nonstop, picking at every surface with their tiny legs. They crawl over plants, substrate, and even each other. The movement never stops.

Molting is both fascinating and nerve-wracking. You will find translucent shed exoskeletons and panic thinking a shrimp died. It did not. But failed molts, where a shrimp gets stuck in its old shell, are always a risk.

Berried females carrying eggs under their tails are a highlight. You watch the eggs develop over two to three weeks, then suddenly dozens of tiny baby shrimp appear on your moss and plants.

Shrimp are escape artists during water changes. They jump into buckets, climb up siphon tubes, and end up in places you never expected. Always check your equipment and waste water for hitchhikers.

Species Overview
Classification
Understanding Them
Creating The Ideal Environment
Feeding
Social Behavior And Tank Mates
Breeding
Frequently Asked Questions
Closing Thoughts
What Most Care Guides Get Wrong
Is the Crystal Red Shrimp Right for You?
Species Comparison
The Reality of Keeping Crystal Red Shrimp
What It Is Actually Like Living With Crystal Red Shrimp

The Crystal Red Shrimp is one of the most rewarding invertebrates in the hobby, but it is also one of the most sensitive. Water parameters matter more here than with almost any fish. After keeping shrimp colonies for years, I have learned exactly what makes or breaks a thriving colony.

One parameter swing and an entire colony dies overnight. That is the reality of keeping Crystal Red Shrimp.

Crystal Red Shrimp do not forgive parameter swings. One bad water change can wipe half a colony overnight. This is not a beginner shrimp.

A Crystal Red Shrimp colony demands stable parameters every single day. One slip and you start over. This is a commitment to precision, not just maintenance.

Shrimp keeping is the most humbling branch of the aquarium hobby. The water does not care about your experience level.

What Most Care Guides Get Wrong About Crystal Red Shrimp

The most damaging myth about Crystal Red Shrimp is that they’re just like Cherry Shrimp but prettier. Crystal Reds are dramatically more sensitive to water parameters and need soft, acidic water with minimal TDS fluctuation. I’ve watched beginners lose entire colonies because they treated them like hardy Neocaridina.

The Reality of Keeping Crystal Red Shrimp

Water parameters rule everything. Shrimp are more sensitive to water chemistry than any fish in your tank. Ammonia, nitrite, and sudden pH swings kill shrimp instantly. A cycled, stable tank is absolutely mandatory before adding your first shrimp.

Copper is lethal. Many fish medications contain copper. Even trace amounts from pipes, fertilizers, or treatments will wipe out an entire shrimp colony. Read every label before adding anything to a shrimp tank.

Molting problems are the most common killer. Shrimp need consistent mineral content to molt successfully. Unstable GH and KH levels cause failed molts, which are fatal. Remineralized RO water gives you the most control.

Biggest Mistake New Owners Make

Adding shrimp to an uncycled tank or a tank that was recently medicated. Both scenarios kill shrimp within days. The tank needs to be fully cycled and medication-free for at least two weeks before shrimp go in.

Expert Take

Drip acclimation is not a suggestion. It is mandatory. Every shrimp I have lost in 25 years died because I rushed the acclimation or ignored a parameter difference.

Key Takeaways

Crystal Red Shrimp require knowledge of their unique grading system, size, lifespan and breeding process for optimal care.
Creating the ideal environment involves maintaining proper water parameters & setting up a tank with compatible tank mates and decorations.
Breeding CRS requires understanding their gender & mating behavior to provide them with the right conditions for successful reproduction.

Species Overview

Scientific Name	Caridina cantonensis ‘Crystal Red’
Common Names	Crystal Red Shrimp, CRS
Family	Atyidae
Origin	Originated from wild black and white bee shrimp in Japan
Diet	Omnivore
Care Level	Moderate
Activity	Moderate
Lifespan	1.5 years
Temperament	Peaceful
Tank Level	Bottom to Mid
Minimum Tank Size	10 gallons
Water Temperature Range	68°-74°F
Water Hardness	0. 4 dKH
pH Range	6.2. 6.8
Filtration/Water Flow	Moderate
Water Type	Freshwater
Breeding	Oviparous
Difficulty to Breed	Easy
Compatibility	Species only for breeding
OK, for Planted Tanks?	Yes

Classification

Phylum	Arthropoda
Class	Malacostraca
Order	Decapoda
Family	Atyidae
Genus	Caridina
Species	C. Cantonensis (Yu, 1938)

Understanding Them

Crystal Red Shrimp (CRS) (Video from our YouTube Channel), or crystal shrimp, are a selectively bred dwarf species of freshwater red bee shrimp originating from Southeast Asia. Their exquisite pattern and shades make them desired by aquarists who like keeping Crystal Reds in their tanks. They have become very popular since their introduction in the United States in the early 2000s. These little creatures come with their own individual grading system based on the number of red stripes found on its body. Something that is sure to attract even more attention from those keen to find suitable CRSs for home aquarium settings.

Speaking, males attain up to 1 inch while females can grow up as large as 1 ½ inches maximum when full grown at maturity – often living one or two years depending upon the environment provided and care given by owners this type requires sensitive water parameters due, unlike hardier cherry shrimp varieties which have also been subject to selective breeding resulting in miniscule baby shrimps during reproduction phases making it an interesting addition into any tank-based setup!

Origin And Habitant

Crystal Red Shrimp, which have been crafted through a process of careful selective breeding from Bee Shrimp found in Taiwan’s freshwater rivers and streams, don’t naturally occur anywhere. Creating the right environment for them is key to making sure they thrive with ideal water parameters and slightly acidic waters being optimal conditions. This kind of shrimp has evolved over time due to generations upon generations of such specialized breeding practice.

Appearance

The Crystal Red Shrimp with its vibrant red and white stripes stands out among other freshwater shrimp species. Males of the breed are smaller in size, while females have wider tails suited for carrying eggs. This distinct coloring gives a unique contrast to planted aquariums when accompanied by an added boost from algae wafers as well.

Shrimp of this particular type have become quite sought-after due to their eye-catching colors and pattern that make them appear different compared to any other variety found within rivers or ponds. The flashy shade offered by these invertebrates really brings life into any tank they inhabit, making them one of the most beloved breeds available today!

Grading System

The categorization of Crystal Red Shrimp is founded on the intensity and symmetry of their hue, with higher tiers having more vivid colors and designs. In order to progress the quality grade level across a CRS colony, aquarists should only breed shrimp that possess desirable coloration patterns.

This grading scale can range from B grade at its lowest point all the way up to SSS grade. Each individual will have their own patterning intricacies that impact pricing as well as grade value. Surprisingly enough, the grade is determined by the amount of white, not the amount of red.

Types

Crystal Red Shrimp belong to the family of Caridina, which encompasses other popular shrimp varieties such as Bee, Crystal White and Tiger.

The Crystal White is identified by the females having a minty blue-green color near their egg holding sections. Tiger shrimp are bred to be darker. They are also known as orange-eyed tiger shrimp due to the color of their eyes. Crystal bees are rare and also the most delicate. They are inbred to develop their features and command high prices.

There are also crystal black shrimp that exhibit the same characteristics but offer a black instead of a red. The same rules grade them.

This diverse group of freshwater shrimp is acclaimed for its unique colorations and designs. CRS can interbreed with various other types from the same species, but doing so may lead to discoloration into brown instead of their natural black or red hue. All in all, these vibrant colored shrimp make up an exciting part of this aquatic ecosystem!

Average Size

Crystal Red Shrimp are a tiny but impactful addition to any aquarium. Males reach up to 1 inch in size while females can get as large as 1.5 inches, making them an ideal choice for aquarists with limited space due to their dwarf shrimp species status. However, the amount of room they require should not be underestimated since it is necessary for ensuring their health. Too small of tanks could lead to negative results down the line.

Lifespan

Crystal Red Shrimp can have a long life (for a shrimp) of 1.5 years if they are provided with the right water conditions and care. Factors such as their diet, stress levels, and especially water quality all contribute to how well these shrimp do over time. When healthy, one will see this species being brightly colored while also actively swimming around. Signs that they’re thriving is when molting happens every 3-4 weeks.

Creating The Ideal Environment

Having the appropriate environment is vital for your Crystal Red Shrimp’s health. Unlike Neocaridina species, they need specific water parameters to survive. By keeping accurate conditions of temperature and pH levels while equipping the aquarium with plants and compatible tank mates, you’ll craft a suitable habitat for them to live in.

It is essential that you remain consistent when setting up their home. This will lead to healthy, thriving shrimp. There are many things to consider, such as:

Knowing the difference between Neocaridina and Caridina shrimp
Getting your water parameters right
Proper tank setup
Feeding
Keeping stress low

Let’s look at the differences between Neocaridina and Caridina first.

Neocaridina Vs Caridina Species

Both Neocaridina and Caridina genera include a variety of freshwater shrimps with unique color varieties, though they have different care requirements. Neocaridina species are more hardy and easier to take care of. For example, the more forgiving Cherry Shrimp, which belongs to the neocaridina species is widely popular.

Cardina shrimp, on the other hand, are harder to care for and more specific on parameter requirements. When it comes to Crystal Red shrimp from the caridina species, accurate water parameters are essential for its survival. Knowing that water parameters are critical for success, let’s talk about what to target when maintaining their environment.

Water Parameters (Water Values)

For optimal growth and reproduction, Crystal Red Shrimp should be housed in an aquarium with a pH level of 6.2-6.8, temperature ranging from 68-74°F and hardness between 4-6 GH. It is necessary to constantly monitor these water parameters since sudden changes can negatively affect the shrimp’s well lbeing due to their sensitivity levels towards it.

TDS is the biggest concern we have after this. These shrimp should be kept at a TDS of around 150. If your tap water source is higher than that, you will need to use RO water and remineralize to get the TDS to the correct range. Always use a TDS meter to measure your tap water source and your RO output.

This is where most Crystal Red Shrimp keepers run into trouble, myself included in conversations with customers over the years. Unlike cherry shrimp, which can handle a wide range of conditions, Crystal Reds have almost no tolerance for parameter swings. A pH spike, a TDS spike, even a careless water change. And you’ll find them dead within hours. If you’re new to shrimp keeping, I’d genuinely recommend starting with cherry shrimp first. Build your confidence with water chemistry, then step up to Crystal Reds when you’re ready.

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HM Digital TDS Meter

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Since these shrimp are comfortable at room temperature, you should be able to get away without a heater unless your area experiences cold winters. Water changes are a must if nitrates start getting high. You should keep nitrates lower than 20PPM for these shrimp. Anything higher should call for a water change.

Tank Setup And Decorations

To create the perfect environment for Crystal Red Shrimp, aim for a tank of at least 10 gallons in size.

You should consider a buffering substrate so the water parameters can stay stable. A great substrate to use would be fluval stratum. This substrate is also great for planted tanks.

Best Value

Fluval Stratum

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A cheaper and beginner friendly alternative to ADA Soil. Also great for shrimp tanks!

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Speaking of which, plants are a must for shrimp. Mosses are one of the best plants you can consider, as it’s great for shrimp to breed and forage in. Carpeting plants are also great for aquascaping and using the active substrate. Floating plants or plants that suck up nutrients like Hornwort are ideal to keep your nutrient levels low.

Decorations such as driftwood and rocks will give them spots to hide and graze on algae within the aquarium. You can use additives like Bacter AE to increase the growth of biofilm when your tank is establishing. For driftwood, consider a low tannin variety like Manzanita for ease of use and better control of tannins.

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Editor’s Choice

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For filtration purposes, you can install a sponge filter that is safe around these creatures while ensuring good water quality remains stable over time. However, it’s not the prettiest. You can install a hang-on back filter or even a canister filter as long as you put a sponge on the intake.

By having all of this set up correctly, you can rest assured your red shrimp are getting everything they need from an enriching habitat without feeling stressed or unsafe.

Feeding

Providing Crystal Red Shrimp with a varied diet plays an important role in their overall health and well being. In its natural habitat, it mostly consumes algae, plant detritus and microorganisms. For successful aquarium care taking they require more than this, such as commercial shrimp food supplemented by blanched vegetables to satisfy their omnivorous tendencies. Keep the portions measured since too much of anything can damage water quality, which inevitably affects them.

My Pick

Dennerle Shrimp King Food

Great For Freshwater Shrimp!

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Having plenty of biofilm is a must as these shrimp need to eat constantly and too much supplemental feeding will pollute the tank. This is accomplished by having lots of available surface such as plants, rocks, and driftwood where biofilm can grow on them.

Biofilm is even more of a necessary food source when it comes to breeding. The more surface area for biofilm the better!

When setting up a crystal red shrimp aquarium, it is important to be mindful of the tank mates you choose for your peaceful CRS. They can thrive in community tanks if other non-aggressive creatures are included – their small size and docile nature mean they won’t pose any harm to them. Nearly every fish will attempt to eat your shrimp, which means if you want to breed them, it’s best to keep them in a species only tank.

Possible Tank Mates

Crystal Red Shrimp need to be provided with appropriate tank mates. These could include other compatible shrimp, such as Cherry or Dwarf varieties. However, these shrimp species will attempt to breed with each other. To avoid cross breeding either only keep one type of shrimp or mix with shrimp like Amanos that will not breed with them.

When it comes to fish, there are only three fish I would consider 100% safe in my personal experience. I haven’t seen many shrimp getting eaten with the following fish. In fact, I’ve never see a clown or octo eat any shrimp I’ve kept with them:

Snails are also great too. Snails like nerites and Malaysian snails are compatible. Avoid large snails like mystery snails, as their bulk can create some issues with your shrimp.

You also have some micro rasboras that can live with these shrimp. However, there is a chance they could pick or attempt to eat your adult crystal red shrimp.

Tank Mates To Avoid

How To Increase Goldfish Life Expectancy

When selecting tank mates for your Crystal Red Shrimp, it is important to be mindful of fish that may be too large or aggressive. Cichlids, goldfish, and barbs should all be avoided as they can easily prey upon the small creature.

Creating an environment in which your shrimp feel safe and secure means choosing creatures with similar temperaments who are not much larger than them. This way, there will likely also exist harmony within the aquarium itself.

Is the Crystal Red Shrimp Right for You?

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

Experience level: Crystal Red Shrimps are best suited for intermediate to advanced keepers. They have specific requirements that can overwhelm beginners.
Tank size commitment: You’ll need at least 10 gallons, though bigger is always better. Make sure you have room for the tank before buying.
Tank mate planning: Crystal Red Shrimps is territorial, so plan your community carefully. Not every fish will work as a tank mate.
Maintenance demands: Expect regular water testing and consistent water changes. Crystal Red Shrimps are sensitive to parameter fluctuations.
Setup investment: Individual Crystal Red Shrimps are affordable, but the right environment adds up. Factor in the full setup cost.
Time investment: Beyond daily feeding and weekly maintenance, regular observation is the best way to catch health issues early.
Long-term commitment: These are living animals that depend entirely on you. Make sure you’re ready for the ongoing responsibility.

Breeding

Breeding Crystal Red Shrimp can provide a great challenge for any aquarist, whether they be beginners or seasoned veterans. By focusing on the water parameters, tank layout, and behavior of these shrimp, hobbyists will be well equipped to nurture their colonies efficiently. It’s also important to understand the mating rituals involved if you are looking for success with breeding crystal reds! I’ll also supply a video from Soo Shrimp Breeders that breaks down how to breed these shrimp in a short amount of time. I’ll have more details below in our blog post:

Preparing The Tank

When breeding Crystal Red Shrimp, it is important to create the ideal tank conditions. Ensure that water temperature remains at or below 74°F as higher temperatures can have an adverse effect on shrimp reproduction. Having a planted aquarium with plenty of hiding spots and grazing areas will increase your chances for successful mating events. This also helps provide baby shrimp somewhere safe to grow up in.

Many shrimp keepers do not keep a separate breeding tank since you can breed them in a display tank. Also long as you don’t have any fish that will eat the young, you should be fine breeding them in your tank. This is why species only tanks are key if you want to breed shrimp!

Identifying Gender And Mating

Knowing the distinctions between male and female Crystal Red Shrimps is essential when attempting to breed them. Male shrimp are slimmer and smaller, while females possess wider tails in which eggs is carried. As noted above. When a female sheds her exoskeleton, pheromones spread across the water, attracting nearby males who will then commence mating activities with her. Keeping an eye on your shrimp’s behavior so you’re able to identify their gender correctly facilitates successful breeding for this species of red shrimp.

Caring for Babies

It is important to take care of the offspring you have bred from Crystal Red Shrimp. When they hatch, baby shrimps come into this world with all their features ready and these should be given specialized shrimp food for adequate nutrition. Carefully observe how your young red shrimps develop. This will affect the quality of your CRS colony significantly if done well. Powedered foods are your friend when it comes to dealing with baby shrimp. Don’t underestimate it!

Frequently Asked Questions

What type of shrimp are crystal shrimp?

Crystal shrimp, which are selectively bred from Bee shrimp and is identified by their bright red and white coloration, make an excellent pet choice for any enthusiast of the species. Commonly referred to as ‘Crystal Red,’ these shrimps have become increasingly popular amongst keepers across the world.

Are crystal shrimp easy to keep?

Crystal shrimp, although expensive and requiring certain needs to be fulfilled in order to thrive, make great pets for those with some aquarium experience. They are quite active but will not turn aggressive when their environment is suitable. However, given their care requirements, there are better alternative shrimp to keep, such as cherry or amano shrimp, that are more forgiving on parameters and considered beginner shrimp.

Where do crystal shrimp come from?

Crystal Red Shrimp, with their striking red and white stripes that add stunning beauty to a planted tank, are a species native to Taiwan. These captivating crustaceans offer an interesting aesthetic for aquariums of all sizes.

What is the highest grade of crystal shrimp?

Crystal Red shrimp, selectively bred from the Bee shrimp variety, is esteemed as the highest grade of Crystal shrimps due to its abundance in white coloration.

What is the ideal tank size for Crystal Red Shrimp?

For maintaining a little school of Crystal Red Shrimp, it is best to have an aquarium that holds at least 10 gallons or more. You can hold a lot of shrimp in a shrimp only tank. As many as 10 per gallon, but you shouldn’t buy to stock as their numbers will increase over time due to breeding.

How the Crystal Red Shrimp Compares to Similar Species

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

The Amano Shrimp is worth considering as well. While the Crystal Red Shrimp and the Amano Shrimp share some overlap in care, they bring different energy to a tank. If you have the space, keeping both in separate setups gives you a great chance to compare their behavior firsthand.

Closing Thoughts

Want easy, forgiving shrimp? Start with cherry shrimp. Want a challenge with stunning payoff? Get crystal reds and commit to RO water.

Crystal reds reward keepers who earn them. Get the RO unit, dial in the TDS, and let the tank mature before adding shrimp. When a Grade S+ crystal red molts cleanly in your tank and the breeding saddles start filling up, you’ll know the setup is right. That moment is why people chase this hobby.

September 28, 2023

Betta Fish Tumors: Causes, Symptoms, and What You Can Actually Do
I’ll be honest: in 25 years of keeping bettas, I’ve never personally dealt with a tumor on one of my fish. It’s actually quite rare in standard betta varieties. the kind most hobbyists keep. Where I see it come up more often is with heavily line-bred or exotic varieties that have been pushed genetically over many generations. My general advice has always been to stick with less modified bettas, both for their health and your sanity. That said, if you’re looking at a growth on your fish right now, there is some hope. and this guide covers what you’re dealing with and what your options are.
Key Takeaways
- Recognize the signs of tumors in betta fish & know how to differentiate between different types.
- Treatments for external/internal tumors vary and may involve surgery, medication, or quarantine.
- Preventive strategies include maintaining good water quality, providing a balanced diet & seeking advice from an experienced vet.
How To Recognize A Betta Fish Tumor

It is important for a betta fish owner to be able to recognize the symptoms of tumors in their pet. Betta fish can develop external and internal growths, which appear differently depending on size, area, and other factors. Identifying them quickly will make treatment more successful.

To detect whether there are any lumps or changes in behavior, we should take into account when caring for our beloved betta fish. We will discuss both external and internal tumors and how they are different.

External Types

Betta fish that are healthy typically will not have any visible abnormalities such as lumps or bumps on the scales. Tumors in betta fish can occur and manifest externally. The most frequent causes include abdominal cancerous growths, lumpy lesions resulting from bacterial infections, and a type of abnormal tissue overgrowth called gill hyperplasia^1, which leads to tumor-like bulges appearing on their gills.

External tumors can appear in various parts of your Betta’s body, including:
- The sides of the betta fish’s body
- Fins and tail
- Belly
- On the gills
- On their head
The common tumors you will come across will be external. Betta fish tumor symptoms aside from the obvious growth are lack of appetite and slowing down of activity. The fish may also become blind as a result.

Internal Types

Internal tumors can be a major issue for betta fish, as they tend to develop inside the body and are more difficult to detect. This condition is due to physical damage, bacterial infections, parasites or toxins in aquarium water causing tumor like growths. Unfortunately, internal tumors or damage are harder to cure and often are subject to euthanization.

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Often times internal tumor are not actually tumors themselves but are a result of conditions such as bloating, dropsy, or bacterial infections.

Causes

Betta fish can develop tumors and understanding the possible causes of this issue can help in both prevention and treatment. Genetic traits, poor dieting habits, unsanitary water conditions as well as viral infections are contributing factors that could be involved in how these fish get cancerous growths.

The risk of developing such a condition is lowered when taking measures to ensure proper nutrition for betta fish. Feed them high-quality products containing all essential nutrients needed for immunity protection. Unhygienic environments should also not be tolerated, so it’s important to keep tanks clean with regular water changes being done regularly.

My Personal Experience

In my experience, I will say that fancier varieties of Betta fish are more prone to tumors than Plakat bettas. I believe this has more to do with all the experimentation that betta breeder do to get the specific breed of fish they sell you and also a combination of not screening their stock well before sale. Most tumors will not appear on a fish later in adult life, leading to the breeder being unable to resolve the issue, so the cycle repeats itself, especially if the fish is bred.

There is no environmental factor or equipment that I would consider that causes tumors to appear more than others (with the exception of Formalin – but most do not use this unless as a last resort). This is me speaking with 25 years of experience and running multiple fish stores in the past. I frequently notice over the years that it is fancier style bettas and koi bettas that experience this more. If you want to decrease your risk, I would recommend that you seek out plakats and avoid plakat koi bettas.

Benign Or Cancerous

When it comes to betta fish, there are two types of tumors they can develop. Benign and cancerous. Benign growths typically don’t spread throughout the body but instead require medication or surgery as treatment methods. On the other hand, a cancerous tumor is much more severe in its effects – reaching other parts of the body and eventually killing the fish.

It’s critical to be able to identify which kind of tumorous issue your betta fish may possess so that you understand how best to treat them accordingly. Benign tumors can be removed with the assistance of a veterinarian.

I know that veterinarians are hard to find in this hobby, so if you can’t find one, try to find an experienced hobbyist who knows what to do and live with the fact that amateur surgery could result in the death of the fish. It’s up to you if you want to take this risk.

I’ve tried with other conditions before, like with swim bladder disease. I don’t have vets around me who can take care of these conditions. Even with my experience, my success rate isn’t that great. It’s not always the condition itself but the stress of the procedure. When I was new to this, I didn’t use solutions like clove oil to knock out my fish. Learn from my mistakes and talk to hobbyists who are offering to do this for you!

Treatment

Unfortunately, if a tumor is identified, there isn’t much you can do, and it’s best for you to address quality of life issues to maximize the comfort of your fish. There are no home remedies that will cure cancerous tumors in betta fish. For those of you lucky enough to have a vet around you, surgical removal is the best way to address this problem. I have a wonderful video in the next section showing you one of the rare Vets in our space who does this procedure.

Surgical Removal

The best betta fish tumor treatment is removing the tumor itself. However, it is an uncertain process with no guarantees of success. It would be best to seek the assistance of a knowledgeable veterinarian experienced in treating tropical fish for such procedures. The following video describes this process in detail. Note the fish is knocked out to prevent stress from the procedure. The fish is also revived carefully by The Fish Doctor. View this video in detail before attempting this with a Vet or with an experienced hobbyist. Note success is not guaranteed.

Common Non-Tumor Lumps

Betta fish can develop lumps for different reasons that aren’t always tumor related. Abscesses, ulcers, swim bladder disease, dropsy, and constipation are some of the most common causes of these growths on betta fish bodies. Let’s talk about these other conditions that could occur and should be evaluated before considering the next steps:

Abscesses

If you see a large white growth on your betta fish, this is likely an abscess due to a loss of scales that has developed into a bacterial infection. This is typically caused by injuries – either from other fish, running into decorations, or being sucked up by a filter. While most injuries should heal on their own, this large white growth is a troublesome sign.

A betta fish abscess if left untreated, will rupture and cause further damage. It should be treated as a bacterial infection, and you should use antibiotics to treat the condition.

Fungal Infections

A white cotton like growth would indicate a fungal infection not a tumor. Those should be treated with anti-fungal medication and typically have good outcomes with treatment.

Columnaris

Columnaris is shown as red marks or growths. It is a bacterial infection that oftentimes will kill a fish. Immediate antibacterial care should be taken ASAP.

Parasites

Parasites can cause bloating or flattening of a belly. This is usually caused by rings or internal parasites, both of which can be cleared with a medication mix of Seachem Focus and General Cure by feeding the affected fish food treated with these two products.

API General Cure

A great general medication for various fish diseases. Can be used in water or fed direct with a binder like SeaChem Focus.

Buy On Amazon Buy On Chewy

Swim Bladder Disease

Swim bladder disease is usually caused by bacterial or parasite infections. Fish suffering from swim bladder disease may experience bump formations because it interferes with their kidney functioning, resulting in fluid retention issues, which manifest through protrusions all over them. They are usually caused by overfeeding, poor temperature stability, or breeding defects.

Dropsy

Dropsy has similar effects since its cause lies within buildups around the body’s cells making scales pop out more than usual due to the bloating processes. A betta fish develops dropsy due to poor water, stress, water temperature instability, and parasites.

Prevention Strategies

Reducing the risk of a tumor on your betta fish developing is a great step and should start before a purchase. Purchasing from a reliable breeder or local store is recommended. Inbred fishes and those coming from poor stock have an increased chance of having health issues like lumps so it’s important that only good quality be chosen.

Providing well balanced diets with keep a healthy fish while regular water changes along with efficient filtration systems need to be implemented along with a low stress environment. Daily checkups are also encouraged as this will allow suspicious activities such as tumors on bodies at early stages to better manage its progress ahead than later times when something unexpected happens already making potential risks hard (or even impossible)to limit if left unchecked longer.

Should I Euthanize?

To euthanize your betta fish is a stressful and heartbreaking decision. Euthanization should be considered if you cannot get an operation and if the stages are advanced. You can euthanize the fish with clove oil, which we have the procedure outlined in our blog post here.

Frequently Asked Questions

How do I know if my fish has a tumor?

External growths in fish can often be identified by feeling for bumps or lumps under the skin. Internal tumors, are harder to detect and are typically fatal. If your fish has a swollen abdomen, it may indicate that they have an internal tumor, which should warrant investigation.

Why does my betta fish have a white bump?

Your betta fish is most likely affected by an external parasitic infection called ick, causing a white bump to appear. This parasite will remain attached for four or five days until it drops off and then attaches itself once more. If the bump is large and raised, this could indicate a bigger issue like a bacterial infection or tumor.

What is the common cause of betta fish death?

The most common explanations for the death of betta fish are issues such as poor water conditions, providing too much food, and having temperatures that are too cool in their habitat, all factors that can harm them physically and create stress levels leading to sickness or demise.

How do you treat betta fish tumors?

For a great majority of tumors and cancers detected in fish, no treatment or cure exists. When discovered early on and the tumor is external, the tumor can be removed with the help of a veterinarian.

How can I differentiate between benign and cancerous tumors?

Benign tumors don’t invade other areas and are simpler to manage than cancerous ones, which can spread.

Closing Thoughts

It is essential for betta fish owners to be aware of the potential issues associated with tumors in their beloved pets. Taking proactive steps such as providing a proper diet and clean tank environment, monitoring your pet’s health daily, and taking prompt action can go far in minimizing any risks related to tumor formation. Catching any warning signs at an early stage is key if effective treatment needs to take place.

Betta fish provide wonderful companionship that should not be taken lightly. It is the owner’s responsibility to ensure they remain healthy and happy through constant caretaking efforts. Always do what’s best for your Betta fish. Let me know if you have any comments to share below, and I’ll be here to answer.

📘 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.
September 27, 2023

750+ Goldfish Names: How to Pick One That Actually Fits Your Fish

I’ve kept goldfish over the years and I’ll be honest. I’ve never been big on naming them. But I’ve noticed that when people do name their fish, the best names almost always come from two things: color and personality. Watch your fish for a few days before you commit. A bright orange one practically names itself. A bold fish that always charges the surface the moment you walk up? That personality will tell you everything. The 750+ names below are organized to make that process easier, whatever direction you’re leaning.

Key Takeaways

Goldfish come in all shapes and sizes and their personalities can be even more varied.
Every goldfish is different and their name will need to reflect who they are as a fish.
There are many goldfish names available, with some being cute and funny and others being plain yet fitting.
Regardless of name goldfish keeping involved a proper tank an environment

Goldfish Personality

If you’re new to goldfish keeping, you might not be aware that every fish has its own unique personality. This personality results from the given species and the fish’s environment, meaning tank conditions, tank mates, and even diet. In addition to all that, there are parts of a fish’s personality that are completely unique to that one fish. No two goldfish are created equal.

Goldfish have a lot of personality, though sadly, they’re seen as some of the less intelligent fish available. Check out our goldfish facts to learn more about them! These fish from the carp family have a fascinating history that’s discussed in this post.

How To Tell Female From A Male

Like other pets (e.g. betta fish), whether your goldfish is a male or female will probably have a lot of influence on its name. While goldfish aren’t the easiest fish to tell apart, you can see the difference in a few ways.

The easiest time to tell your male and female goldfish apart is during spawning times. This is because both fish undergo both physical and behavioral changes.

Goldfish spawning time is naturally during the spring and summer when waters start to warm. With the power of an aquarium heater and water changes, this water temperature difference can be replicated in the home aquarium or small pond.

During spawning periods, male goldfish develop tubercles on the sides of their gills. These are small, white bumps that rise under the skin and scales. It is unknown how tubercles aid the fish in reproduction, but a greater abundance of them seems to result in more successful responses and matings from female goldfish. Tubercles may also be present on the pectoral fins.

Goldfish tubercles¹ can greatly resemble an aquarium parasite, like white spot disease also known as ich. Diagnosing illnesses can be difficult in the home aquarium and even more challenging in a larger pond with more outside factors.

In comparison to tubercles, ich is much less uniform and causes the goldfish to behave differently. Ich covers the entire body of the fish while tubercles stick to the gills and pectoral fins. Ich also causes the fish to appear sick by discoloration and flashing; ich causes the goldfish to have irritated and itchy skin, which results in sudden movements and scratching called flashing.

If your male goldfish presents with bumpy gills and bright coloration, then he is showing that he is ready to mate. If those signs weren’t enough, then your pet fish will also likely chase other fish around the aquarium almost to the point of harassment.

At the same time, female goldfish will also change in appearance, though not as drastically. The major difference is the enlargement of the vent. This is an opening behind the anal fins, which will become much more pronounced when the goldfish is ready to mate. The female goldfish will also deepen in color and produce a more rounded belly as she fills up with eggs.

Otherwise, knowing if your pet goldfish is male or female can be almost impossible. Good thing that there are plenty of gold fish names that are suitable for both!

How To Choose

Naming any pet can be hard, but naming a pet goldfish might seem like an impossible task. How can you name something that you can’t even interact with?

Believe it or not, you will interact with and get to know your pet fish just as much as with any other pet.

Goldfish have personality! And your goldfish’s name should reflect that. Many goldfish names could perfectly encapsulate your goldfish.

Goldfish can be funny, playful, cute, smart, or all of the above. They can also be mysterious, troublesome, lazy, or maybe not as smart as their comrades. Goldfish are unique, which means that they all need unique names.

Some hobbyists like funny goldfish names that play at pop culture references or historical figures. Others opt for more common goldfish names, like the equivalent of a dog being called Max. Some hobbyists change their goldfish’s name every week, while others never get around to giving their fish a name.

Keep in mind that it might be difficult to tell your goldfish apart from one another, which might just lead to every fish having the same name!

How Do You Know If Its The Right One?

It’s pretty easy to look at a list of the most popular names for goldfish and give one to your fish, but how do you know it’s right forever? Goldfish have surprisingly long lives, sometimes surpassing two decades (longer than a family cat or dog), so you definitely need a name that will last as they become long-standing family members in your household.

Something strange happens when naming any pet, including goldfish. You’ll often find that a name comes to the pet all by itself. This could be due to noticing a particular habit in the fish or another moment in life that just seems to perfectly apply to your goldfish.

The best way to see if the goldfish names you’re considering for your fish are good is by trying them on for size. Simply start calling your fish by the name and see if it feels right and if it sticks. If it doesn’t fit, then try another.

If all else fails, let your fish choose its own name. You can do this by writing a couple of goldfish names on a piece of paper, holding them next to the fish tank, and seeing where your goldfish swims. In this way, your goldfish names itself!

For Males

Fin	Oliver	Buddy	Lionel	Hugo
Flynn	George	Pippin	Theodore	Dexter
Max	Leo	Gizmo	Ulysses	Quicy
Elvis	Sammy	Winston	Xavier	Gavin
Kraken	Hank	Chip	Finnegan	Atticus
Squid	Louie	Aflie	Nolan	Nico
Jack	Tucker	Nugget	Hudson	Yannick
James	Gus	Lewis	Owen	Maximus
Samuel	Milo	Ace	Miles	Percival
Noah	Rosco	Franklin	Silas	Orlando

For Females

Duthess	Mia	Charlotte	Cora	Helena
Cynthia	Gigi	Madison	Beatrice	Claudia
Grace	Winnie	Isabella	Delilah	Odette
Lucy	Kiki	Hannah	Ophelia	Daphne
Poppy	Phoebe	Celeste	Ursula	Eloise
Penelope	Piper	Minnie	Cecilia	Gwendolyn
Emma	Roxy	Kitty	Tessa	Minerva
Olivia	Lizzy	Lulu	Wrex	Beatrix
Zoe	Lola	Coco	Fae	Guinevere
Ava	Lulu	Muffin	Una	Roxanne

Gender Neutral

Bubbles	Fish	Mercury	Charlie	Dakota
Lucky	Fishy	Mars	Sailor	Casey
Skipper	Splash	Venus	Echo	Emery
Spark	Kelp	Pirate	Harley	Jamie
Shimmer	Spicy	Riley	Kai	Shiloh
Harper	Pluto	Buddy	Remy	Elliot
Rowan	Sawyer

By Color

Goldfish come in a lot of colors. This list has names for major color variants of goldfish.

Red	Blue	White	Black	Orange	Violet	Multi-Colored
Flame	Blue	Ghost	Night	Goldie	Violet	Freckles
Penny	Azure	Snowflake	Raisin	Golden	Violette	Spot
Rosie	Aquamarine	Snow	Prune	Sun	Violetta	Patches
Crimson	Indigo	Dove	Void	Sunshine	Lavender	Polka
Cherry	Cyan	Chrome	Onyx	Sunny	Thistle	Rainbow
Scarlet	Cerulean	Platinum	Midnight	Tiger	Mauve	Kaleidoscope
Valentine	Teal	Titanium	Panther	Sunkist	Royal	Checkers
Ember	Periwinkle	Steel	Bandit	Fanta	Regal	Motley
Merlot	Cobalt	Nickel	Coal	Paprika	Magenta	Stripes
Bricket	Navy	Frost	Crow	Honeysuckle	Aubergine	Prism
Rojo	Demin	Moonbeam	Raven	Marigold	Purple Haze	Pixel
Poppy	Aqua	Angel	Licorice	Firecracker	Acai	Chroma
Blaze	Nautic	Sterling	Salem	Auburn	Concord	Dotty
Redford	Fjord	Casper	Shadow	Tango	Vivienne	Marble
Sorrel	Nile	Misty	Abyss	Harvest		Domino
Hawk	Voyager	Moon	Eclipse	Mimosa		Dot
Clay	Polaris	Luna	Jet	Firefly		Seashell
Burgundy	Bluemoon	Alabaster	Obsidian	Peaches ‘n Cream		Callie
Vixen	Whale	Yeti	Nightshade	Goldfinch		Technicolor

By Tail Type

A goldfish name based on their tail makes a lot of sense with the types of fancy goldfish and long-finned varieties available in the hobby. Here are several that might help.

Flow
Silky
Wisp
Flutter
Plume
Velvet
Fuzzy
Majesty

Pop Culture References

Who doesn’t like a pet with a Pop Culture reference? Below are names with references and where they come from.

Tinkerbell – a fairy-like character from J. M. Barrie’s novel, “Peter Pan”
Phelps – after the United States Olympic swimmer, Michael Phelps
Lochte – another US Olympic swimmer, Ryan Lochte
Forrest Gump – a 1994 film starring Tom Hanks
Hulk – a large green fictional superhero
Romeo – of “Romeo and Juliet” by William Shakespeare
Juliet – of “Romeo and Juliet”
Elon – named after Elon Musk, an entrepreneur and inventor
Britney – named after pop singer, Britney Spears
Ziggy Stardust – named after British performer, David Bowie
Gilligan – inspired by the TV show, “Gilligan’s Island”
Prince – named after American performer, Prince
Beyoncé – named after American singer, Beyoncé
Gaga – named after American singer and performer, Lady Gaga
Taylor – after American singer and songwriter, Taylor Swift
Kanye – named after American rapper, Kanye West
Jaws – after the 1975 film about a killer shark
Nemo – inspired by Pixar’s “Finding Nemo”
Dory – after the hippo tang in “Finding Nemo”
Marlin – after the father clownfish in “Finding Nemo”
Squirt – after the young sea turtle in “Finding Nemo”
Gil – after the Moorish idol in “Finding Nemo”
Bruce – after the main shark in “Finding Nemo”
Captain Morgan – a popular alcoholic rum brand
Flounder – after the yellow and blue striped fish in Disney’s “Little Mermaid”
Sebastian – after the crab in “Little Mermaid”
Ariel – after the mermaid in “Little Mermaid”
Cleo – after the goldfish in Disney’s “Pinocchio”
Batman – inspired by the superhero in DC Comics
Zorro – after a masked fictional character created by Johnston McCulley
Darth Vader – after a fictional villain in George Lucas’ “Star Wars”
Willy – inspired by the film, “Free Willy”
Captain Jack Sparrow – after the pirate character in “Pirates of the Caribbean”
Captain Barbossa – after the villain in “Pirates of the Caribbean”
Captain Hook – after the villain in “Peter Pan”
Cap’n Crunch – inspired by the cereal character
Chewbacca – a furry character in “Star Wars”
Aquaman – a superhero in the DC Comics
Flipper – after the 1964 TV series, “Flipper”
Moby Dick – inspired by Herman Melville’s novel
Jacques Cousteau – after the famous French oceanographer
Long John Silver – inspired by the American fast food chain restaurant
Rambo – named after the “Rambo” franchise
Simba – inspired by Disney’s “The Lion King”
Nala – from “The Lion King”
Mufasa – from “The Lion King”
Zazu – from “The Lion King”
Spongebob – after the main character in the famous TV series
Dumbledore – named after the great wizard in the “Harry Potter” series
Harry – from “Harry Potter”
Hermoine – from “Harry Potter”
Ron – from “Harry Potter”
Dobby – from “Harry Potter”
Frodo – from J. R. R. Tolkien’s “Lord of the Rings” franchise
Bilbo – from “Lord of the Rings”
Gandalf – from “Lord of the Rings”
Gollum – from “Lord of the Rings”
Aragorn – from “Lord of the Rings”
Jon Snow – after the character in George R. R. Martin’s “Games of Thrones”
Khaleesi – from “Game of Thrones”
Cersei – from “Game of Thrones”
Drogo – from “Game of Thrones”
Tyrion – from “Game of Thrones”
Spock – after Gene Roddenberry’s “Star Trek” franchise
Kirk – from “Star Trek”
Picard – from “Star Trek”
Worf – from “Star Trek”
Sherlock – named after Arthur Conan Doyle’s fictional detective
Goldie Hawn – based on the famous actor

By Gemstones

Opal	Emerald	Amber	Sardonyx	Peridot
Ruby	Amethyst	Topaz	Citrine	Agate
Diamond	Sapphire	Quartz	Onyx	Turquoise
Crystal	Adamite	Moonstone	Pearl	Jasper

Japanese Origins

Kingyo – “Goldfish”
Samurai – “Warrior”
Yoshe – “Beauty”
Kaida – “Little dragon”
Runa – “Moon”
Kenzo – “Healthy”/”Wise”
Sakura – “Cherry blossoms”
Maru – “Round”
Umi – “Sea”
Nori – “Seaweed”
Taiyo – “Sun”
Hoshi – “Star”
Tora – “Tiger”
Kiku – “Chrysanthemum”
Koi – “Love”/”Carp”
Yuki – “Snow”

Chinese Origins

Goldfish originate from China. Here are several names with good meanings behind them.

Bao – “Treasure”
Ginkgo – after the Gingko tree
Sying – “Star”
Longwei – “Dragon greatness”
Dai – “Respect”
Huang – “Bright”
Yang – “Light”/”Sun”
Tao – “Path”/”Virtue”
Hongse – “Red”
Yue – “Moon”
Lin – “Gem”

Asian Origins

China, Japan, and Thailand are the best three countries for goldfish breeders. We have several Asian name ideas that could fit the bill for your fish!

Dalkong (Korean) – “Sweetie”
Dae (Korean) – “Greatness”
Hwan (Korean) – “Bright”
Taeyang (Korean) – “Sun”
Jia (Korean) – “Good”/”Wisdom”
Satang (Korean) – “Candy”
Yejin (Korean) – “Rare”
Bada (Korean) – “Sea”
Dal (Korean) – “Moon”
Cho (Korean) – “Handsome”
Mali (Thai) – “Jasmine flower”
Singha (Thai) – “Lion”
Lukchup (Thai) – “Sweet”/”Candy”
Suriya (Thai) – “Sun”
Sawasdee (Thai) – A greeting
Kao (Thai) – “White”
Oun (Thai) – “Chubby”
Som (Thai) – “Sour”/”Orange”
Lek (Thai) – “Tiny”
Naka (Thai) – “Dragon”
Manis (Indonesian) – “Sweet”
Putih (Indonesian) – “White”
Raja (Indonesian) – “King”
Cinta (Indonesian) – “Love”
Bimo (Indonesian) – “Brave”
Biru (Indonesian) – “Blue”
Pelangi (Indonesian) – “Rainbow”
Bulan (Indonesian) – “Moon”
Ratu (Indonesian) – “Ratu”
Jelita (Indonesian) – “Beautiful”

Nature Based

Wind	Star	Sage	Comet	Smokey
River	Starlight	Aurora	Star	Bee
Rock	Daisy	Tide	Toad	Flower
Autumn	Sunflower	Orion	Frog	Fleur
Spring	Dandelion	Sky	Lily	Forest
Summer	Sunset	Brook	Lilac	Solstice
Winter	Cloud	Maple	Iris	Pinecone
Boulder	Bear	Ivy	Rose	Terra
Stormy	Woody	Reef	Coral	Falcon
Sandy	Blossom	Lunar	Thunder	Sparrow

Mythology Based

Zeus	Peresphone	Anubis	Aphrodite	Selene
Styx	Perseus	Amun	Demeter	Freyja
Thor	Hermes	Dionysus	Cupid	Dragon
Athena	Triton	Osiris	Hecate	Minotaur
Neptune	Titan	Ra	Psyche	Unicorn
Kelpie	Nyx	Njord	Pegasus	Centaur
Hades	Siren	Hercules	Atlas	Nymph
Loki	Selkie	Freya	Midas	Goblin
Poseidon	Horus	Artemis	Icarus	Wyvern
Apollo	Achilles	Bastet	Prometheus	Cyclops

Historic Based

Beethoven	Franklin	Descartes	Fidel	Nelson Mandela
Mozart	Amelia	Nietzsche	Castro	Nikola
Bach	Hemingway	King Henry VIII	Annie Oakley	Michelangelo
Clopatra	Frida	Rosa	Machiavelli	Vincent Van Gogh
Napoleon	Galileo	Confucius	Florence	Salvador Dali
Einstein	Houdini	Frankenstein	Newton	Gustav
Licoln	Alexander	Picasso	Edison	Rembrandt
Shakespeare	Aristole	Marie Antionette	Marco	Polluck
Caesar	Plato	Homer	Abraham	Claude
Socrates	Kant	Gandi	Sojourner	Raphael

Famous Goldfish

Goldfish have been featured in several movies. Here are a few you may be familiar with:

Cleo – Pinocchio
Dennis – Stanley – A talking pet goldfish
Klaus Heisler – American Dad! The pet goldfish of the Smiths
Chuckles – The goldfish from Find Nemo
Dorthy – The goldfish that appears on Sesame Street
Cosmo – From Fairy odd parents
Wanda – From Fairy odd parents

Food Based

Sushi	Nutmeg	Oreo	Latte	Nacho
Sashimi	Sherbert	Cinnamon	Cappuccino	Apricot
Wasabi	Sweet Tea	Honey	Coffee	Truffles
Sugar	Seaweed	Mulberry	Noodle	Clementine
Blueberry	Tofu	Marshmallow	Cheesecake	Creamsicle
Apple	Walnut	Olive	Potato	Mango
Grapefruit	Brandy	Pepper	Wipped Cream	Tangerine
Twix	Citrus	Peppermint	Fudge	Pistachio
Popcorn	Plum	Peanut	Peach	Ginger
Pea	Rosemary	Tater tot	Toffee	Pizza
Sweatpea	Jellybean	Mochi	Kiwi	Lime
Grape	Cheeto	Chestnut	Cheddar	Keylime
Buttercup	Jelly	Eggplant	Gouda	Lemon
Caramel	Jam	Pumpkin	Mozzarella	Lemondrop

By Personality

Killer	Destroyer	Kisses	Zippy	Brainy
Shark	Fury	Pebbles	Mako	Princess
Sparky	Chonky	Dart	Tranquil	Prince
Wiggle	Chuky	Pokey	Gulp	Queen
Hungry	Whisker	Ripple	Trouble	King
Jumper	Nibbles	Mystique	Biggie	Hubris

Funny

Billie Ei-fish	Swimmy Hendrix	Sharkira	Hunter	Pisces
Fin Diesel	Bubbles Galore	Salmon	Mellow	Cavier
Fin-derella	Fishbert	Tuna	Giggles	Grouper
Salmonella	Finnocent	Trout	Shrimp	Algae
Carp Diem	Fishy McFisherson	Anchovy	Jitterbug	Sea Squirt
James Pond	Bubbly Spears	Turbo	Shipwreck	The Captain
Fish Nugget	Sir Swims-A-Lot	Bites	Captain	El Captain
Fishy Smalls	Clam Clowder	Fiet	Nessie	Seabuscuit
Fish And Chips	Sharknado	Typhoon	Orca	Swim Shady
Lake Skywalker	Fintasia	Marine	Blubber	Starfish

Edgy

Venom	Slasher	Rogue	Devil	Savage
Anarchy	Menance	Xena	Diablo	Nemesis
Grim	Maverick	Talon	Obscura	Vortex
Mortis	Havoc	Rex	Euphoria	Thorn
Banshee	Mischief	Axel	Succubus	Tempest
Chaos	Nova	Lucifer	Pandora	Sphinx
Viper	Marauder	Ransom

FAQ

What are some of the most famous fish names?

The most popular names for fish originate from Pixar’s “Finding Nemo”. This film follows father and son, Marlin and Nemo respectively, saltwater clownfish across the ocean. As such, these names have become popular for all fish species, especially orange fish, that resemble those in the movie.

What are funny goldfish names?

Goldfish are funny fish and you might want some funny names to match their personalities. There are a few funny goldfish names on this list, including Billie Ei-fish, Swim Shady, and Fin Diesel.

What are cute goldfish names?

On top of being funny, goldfish can also be pretty cute, especially some of the chubby fancy varieties. Some of the best cute goldfish names include Pumpkin, Daisy, Squirt, and Lemondrop.

What are clever goldfish names?

Even if your goldfish isn’t the smartest doesn’t mean it can’t be named after some of the world’s geniuses. Some clever goldfish names are Socrates, Einstein, and Shakespeare. If you have another favorite author or movie star, then find inspiration in their name!

What should you name your goldfish?

There is no right or wrong name for your pet fish! Whatever you decide to name your goldfish is unique to you and your goldfish.

Final Thoughts

What’s in a fish name? That’s to be decided by you and your aquarium fish!

Goldfish names can be exciting and unique or plain and ordinary. It can be initially difficult to tell male goldfish apart from females, but looking at the male’s tubercles and coloration along with the female’s vent during spawning times can help you spot the differences. Also, don’t feel bad if you mix up one fish with another! These orange fish can start to look very similar after a while.

What names have you called your goldfish? Let us know in the comments below.

📘 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.

September 26, 2023

Do Fish Sleep? What 25 Years of Watching Tanks Taught Me
One of the questions I get surprisingly often. even from people who’ve been in the hobby for years. is whether fish actually sleep. I noticed it myself early on: my bettas would go still near the surface or rest on a leaf late at night, barely moving. My cichlids would find a corner of the tank and just hover. It took me a while to realize that’s exactly what fish sleep looks like. No eyelids, no lying down. but the rest-state is real, and understanding it actually matters for how you set up your tank and your lighting schedule.

And today, in this article, we’ll cover everything about how a fish sleep.

So, stay with me!

Do fish sleep?

As mentioned earlier, like all living beings, fish sleep too. However, their sleep is different than the sleep of mammals birds, or other animals. That’s because they don’t need a land to rest their body, they don’t need beds, covers, or even eyelids. Basically, most fish cannot even close their eyes (except sharks). Check out the video above from our YouTube Channel and follow along with our blog post.

The Definition

To discuss the topic, we need to talk about the actual definition of sleep so we have the proper frameset when talking about our pets. Here is the definition:

Sleep has a simple definition that includes closed eyelids and a particular brainwave pattern in the neocortex – which makes sleep easy to determine for most animals. However, this makes it difficult for fish because they have neither a neocortex or eyelids.

The University of Zurith did a study of over 150 animals to determine if all animals sleep¹. They determined that all animal sleeps – even microbes! This study used Henri Pieron’s definition of sleep. There are 4 key characteristics:
1. A species specific sleep posture
2. The maintenance of behavioral quiescence (inactivity/dormancy)
3. Elevation of arousal threshold (takes effort to get organism to react)
4. Reversibility with stimulation (we can wake them up)
Fish mostly sleep in the form of activity reduction and lower response to stimulus. So, next time, when you find your fish floating in the tank with minimal body movement and changed body coloration, know that it is just sleeping.

Stanford researchers have found that the freshwater zebrafish slumber much the way we do: They display a type of slow-wave sleep and a type of REM (also known as paradoxical) sleep. The discovery suggests that these neural sleep signatures — present in mammals, reptiles, and birds — emerged at least 450 million years ago.

It is crucial to understand that fish sleep doesn’t include rapid eye movement (REM sleep), which is associated with dreaming in mammals. In fish species, sleep only occurs with reduced activity levels to save energy and undergo physiological changes to restore or rejuvenate the body.

Some diurnal species (fish that sleep at night) will actually be active during day and night if they are doing something very involved such as migration. You will see this with Tilapia and even eels when they are trying to mate.
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Fun Fact: Zebrafish species can exhibit two sleep cycles like most higher vertebrates.
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Mindblowing Behaviors Of Dolphins

Some animals like marine mammals exhibit even stranger behavior. Dolphins do not have gills and need to surface to breathe. They can maintain a sleep cycle by shutting off half the hemispheres of their brain. This is known as unihemispheric slow-wave sleep. While one half of the brain sleeps, the other half keeps them swimming and tracks their need to surface for air while the other half sleeps.

Other behaviors from dolphins include “logging” which is them floating to the surface on their sides like a log to rest and still breathe air.

How do fish species sleep?

Like other animals that require sleep to stay healthy, fish also need sleep to undergo many bodily changes. However, fish sleep differs from other animals. For example, most fish are sleeping while hovering in the water or lying on the sand or substrate, reducing their activity levels. In such conditions, they conserve energy and their metabolic rate decreases they will not respond to external stimuli like usual. Also, the fact that fish do not have eyelids, makes it challenging to figure out if the fish are sleeping.

Furthermore, many fish seek out shelters or hiding places when they are in resting mode to protect themselves from predators. Therefore, adding crevices, under rocks, and driftwood is recommended to keep in your aquariums.

How does parrot fish sleep?

Parrotfish sleep in a very interesting way. They make their own cocoons in the form of sleeping bag by secreting their mucous around them every night, protecting them from predators and parasites.

How do fish from fast moving water sleep?

Many different fish species, including pelagic fish and sharks, are constantly moving even when they are resting to ensure a constant water flow and oxygen supply over the gills.

Other than that, there are several fish species with swim bladder that maintain buoyancy, so even when the fish sleeps, it still floats in the water.

How can you tell when your aquatic pet is sleeping?

Chances are your fish are sleeping, but showing no apparent signs of sleep because obviously, they don’t human sleep behaviors.

Therefore, it is necessary to figure out how your fish sleeps and provide adequate night time to maintain overall health. Like humans, fish may show signs of sleep deprivation. Thus, provide adjustable aquarium light to understand your fish’s sleep patterns and allow your fish to sleep soundly.

Since fish do not have eyelids, you cannot judge whether it’s sleeping. However, there are a few ways to spot a sleeping fish in your aquarium.

Location

Look out for fish that are resting on the bottom or just hovering without being active. If you have a school of fish, you may notice a small group resting somewhere around the corner. Other fish may be sleeping or resting in or around tank decorations or caves.

Signs of deprivation

There are thousands of research done on sleep deprivation in many invertebrates and other mammals, but there is little available data on fish. In fact, almost all studies have been conducted on some species, like zebrafish, to know the potential signs of sleep deprivation².
1. One of the common signs is increased resting
2. No response to external stimuli even to potential environmental threats
3. Changes in activity patterns
4. Difficulty in learning and memory tasks
5. Potential stress due to increased cortisol levels
Note that 4 and 5 are hard to observe in the tank. However, in the studies cited, fish can suffer from insomnia and can develop sleeping disorders. Their sleep is also regulated by Melatonin³.

How Do I Make Sure They Get Enough?

One of the easiest ways to let your fish fall asleep is by putting your lights on a timer. This provides your fish with a consistent day and night routine like you would normally do for other animals. Avoid having your fish in constant light.

It is also recommended to provide hiding places and cover in your aquarium in the form of rocks, caves, driftwood, and other tank decors or aquarium plants, so your fish feels safe and secure in the aquarium while resting. For example, fish living near coral reefs love to hide during the nighttime. Thus, replicate their environment for a better and deeper sleep.

During their sleep state, avoid slamming the doors or watching TV at loud volume. Also, do not allow your pets to go near the tank when the fish are sleeping.

When transitioning from dark periods to daytime, I recommend gradually brightening the aquarium lights to stimulate natural sleep cycles.

FAQs

How do you know if a fish is sleeping?

There are a few signs of a sleeping fish:
1. Inactive or motionless during periods of time
2. Laying on the bottom or just hovering on any aquarium object
3. Not responding to any external stimuli, even food.
Do Fish Suffer From Sleep Disorder?

Even though there’s not a lot of research material available on sleep disorders in fish, however, studies on zebra danios, suggest that the fish may sleep more when there’s a sleep loss.

Do fish swim when they sleep?

It depends on the fish species and the type of sleep you get. For example, many fish are almost completely inactive during resting period or they just hover in one place or lie on the substrate. While other fish are continuous swimmers, especially those living in fast-flowing waters, such as Pelagic fish. However, some fish find hiding spots so they can rest without swimming between rocks, corals, or other tank decors.

Many species of catfish or rays rest on the bottom during resting periods.

Do fish close their eyes?

No. Fish do not close their eyes during sleep because they don’t have eyelids.

How long do fish sleep at a time?

Aquarium fish may sleep for around 8 to 12 hours, depending on the aquarium light and other factors.

Do fish sleep or close their eyes?

Yes, like all other animals, fish do sleep. No, they don’t close their eyes because they don’t have eyelids.

Final Thoughts

Sleep is important for the well-being of animals, including fish. However, fish don’t sleep in a conventional way like many animals, and they do not follow circadian rhythm as strictly as humans do. Still, they put their bodies at rest and adjust their sleep routine to water temperature, food, migration patterns, and other factors.
September 25, 2023

Tag: Fishkeeping

Iridescent Shark: An Honest Care Guide (And Why Most Aquarists Shouldn’t Buy One)

What It Is Actually Like Living With Iridescent Shark

What Most Care Guides Get Wrong About Iridescent Shark

The Reality of Keeping Iridescent Shark

Biggest Mistake New Owners Make

Expert Take

Key Takeaways

Species Overview

Introduction

Natural Habitat And Distribution

Appearance

Size And Growth

Caring for Your Iridescent Shark

Tank Size And Setup

Water Parameters And Filtration

Feeding

Behavior And Socialization

Tank Mates

Startle Response And Precautions

Health Concerns And Disease Prevention

Breeding Challenges And Considerations

Frequently Asked Questions

Is the Iridescent Shark Right for You?

Closing Thoughts

10 Types of Fish Tanks: How to Choose the Right Setup for Your Budget

Key Takeaways

Top 10 Types Of Fish Tanks

1. Cold Water Aquarium

2. Brackish

3. Tropical Community Setup

4. Freshwater Aggressive

5. African Cichlid Tank

6. Planted Aquarium

7. Paludarium

8. Saltwater Fish-Only (FOWLR)

9. Reef Tank

10. Saltwater Predators

7 Types Of Aquariums You Can Buy

1. Nano Tanks

2. All-In-One Aquariums

3. Reef-Ready Aquariums

4. Glass vs. Acrylic

5. Rectangles vs. Cubes

6. Tall vs. Shallow Aquariums

7. Rimmed vs. Rimless

How To Choose Your Fish Tank

Size

Marine vs. Freshwater

Placement

FAQs

Closing Thoughts

Where to Buy Fish and Equipment

How Big Do Betta Fish Get? Size, Growth, and What Actually Makes a Difference

Key Takeaways

How Big Do Betta Fish Get?

How About In The Wild?

What Is The Minimum Tank Size For Them?

How Fast Do They Get To Adult Size?

How To Make Them Grow Faster

Tank Size

Clean tank

Water temperature

Balanced diet

Water quality

Lighting conditions

FAQS

Final Thoughts

References

Betta Fish Water Guide: What I Use After 25 Years and How to Treat It Right

Key Takeaways

Why It Matters

Betta Fish Water Sources

1. Tap Sources

Pros

Cons

2. Bottled Water

Pros

Cons

3. Well Water