Axolotl Care Guide: Temperature, Diet, Lifespan and Tank Mates

By Aquarium Guides Editorial Team · Updated October 17, 2026

Last Updated: October 17, 2026

An axolotl is not a fish but a fully aquatic salamander (Ambystoma mexicanum) that needs cool water around 60 to 64 F (16 to 18 C), a tank of at least 20 gallons long with a gentle filter, a soft or bare bottom, and a meaty diet, and it lives alone because tank mates usually end badly for one or both animals. With good care axolotls commonly live around 10 to 15 years, so they are a long commitment and are not a beginner “fish tank” pet.

Axolotl Quick Facts

Why an Axolotl Is Not a Fish

Although people search for “axolotl fish”, the animal is an amphibian. It keeps its external feathery gills and stays aquatic for life, a trait called neoteny, instead of changing into a land-living salamander. Wild axolotls come from the high-altitude lake system around Mexico City and are critically endangered in the wild, while captive-bred animals are widely kept. That origin explains the need for cool, clean water and the sensitivity to heat and ammonia. Before buying, check local laws: axolotls are restricted or banned in some US states and other regions, and the species is listed in CITES Appendix II, which regulates international trade rather than domestic ownership. Sources disagree on the exact state-by-state rules and the laws change: California is widely reported as banning them, while other states are reported as requiring permits or are described inconsistently. Check with your state or local wildlife agency before buying.

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Temperature: The Make-or-Break Factor

Most guides give 60 to 64 F (16 to 18 C) as the target, with 60 to 68 F (16 to 20 C) as an acceptable range. Above about 72 F (22 C), axolotls become stressed, stop eating and develop fungal infections, and sustained heat above that can be fatal. Do not use a heater. In a warm climate you may need a fan across the water surface, a room that stays cool or an aquarium chiller. Place the tank away from windows and electronics, and watch temperature during summer with a thermometer.

Tank Size and Layout

A 20-gallon long tank (about 30 by 12 by 12 inches) is a common minimum for one adult. Some axolotl specialists argue that this is too small and prefer a 29-gallon or 40-gallon breeder, which gives a larger floor area and more stable water. One veterinary clinic page also suggests adding at least 10 more gallons for each additional animal. Floor area matters more than height, because axolotls walk along the bottom and only occasionally rise to gulp air. A tight lid or mesh top stops jumping, and a water level of 12 to 18 inches avoids the need for deep swimming but still gives room.

• Hides: a smooth ceramic cave or pipe, because axolotls dislike bright light.
• Plants: hardy, cold-tolerant plants such as java fern, anubias and anacharis; or silk plants. Avoid sharp plastic.
• Lighting: low light; axolotls have no eyelids.
• Cycle first: the tank must be fully cycled before the animal goes in.

Substrate Safety

Axolotls suck food in with a gulping motion and often swallow substrate with it. Gravel is a well-known impaction risk, and hobby guides cite particles from about 2 mm up to roughly 20 mm as small enough to be swallowed during feeding. Safer options are a bare bottom, fine sand with grains small enough to pass through the gut, or very large smooth stones too big to swallow, typically larger than the animal’s head. Some keepers use a bare bottom until the animal is about 6 inches (15 cm) long before introducing sand. Rough decor and glass-edged items can scrape the delicate skin.

Filtration and Flow

Axolotls dislike strong current, which stresses them and can cause gills to curl forward. Use a sponge filter or a filter with an adjustable outflow baffled against the glass. Water must be very clean because axolotls are sensitive to ammonia, nitrite and chlorine. Test for zero ammonia and nitrite, and keep nitrate low. Dechlorinate all tap water. Avoid medications that contain harsh chemicals unless advised by an exotic-animal veterinarian.

Feeding an Axolotl

Axolotls are carnivores that detect food by smell and movement. Earthworms and nightcrawlers are a common staple, supported by good sinking salamander or axolotl pellets and the occasional bloodworm, blackworm or shrimp. Juveniles eat daily, while adults are often fed every two to three days. Do not feed feeder fish, which carry parasites, or mammal meat. Remove uneaten food within a few hours.

Weekly Maintenance Schedule

Tank Mates: Why Most Are a Bad Idea

Axolotls are best kept alone or with another axolotl of similar size. They will eat anything that fits in their mouths, and many fish nip at the feathery gills, causing infections and stress. Cold-water temperatures also rarely suit tropical fish. Even same-size axolotls can bite each other, especially juveniles competing for food, and a missing limb or gill may regrow, but repeated injuries are a welfare problem.

Handling

Axolotls have delicate, permeable skin and a protective slime coat. Handling should be minimal. When a move is essential, use a soft, fine-mesh net or a container, not bare dry hands, and keep the animal in water. Avoid lifting by the body and never handle with hand lotions or chemicals on your skin. Wet hands that have been washed without soap are less harmful, but any handling is stressful. Wash hands before and after touching the water, since amphibians can carry bacteria.

Common Problems

Axolotls are exotic pets, and an exotic or amphibian-experienced vet should be consulted for persistent symptoms.

Common Mistakes

• Keeping the tank in a warm room without cooling.
• Using gravel as substrate.
• Strong filter flow or air stones that buffet the animal.
• Adding fish, because “they will be fine”.
• Skipping the nitrogen cycle.
• Expecting a short-lived, low-effort pet when the lifespan is over a decade.

Who Axolotls Suit

Axolotls suit keepers who live in a cool climate or can run a chiller, who enjoy watching a calm, quiet animal and who accept minimal handling. They do not suit people wanting an interactive pet or a colourful community tank, or anyone unable to guarantee a long-term home and legal ownership. Because they live for many years and are endangered in the wild, keepers should buy from responsible captive breeders and never release any animal into local waters.

Setting Up a New Axolotl Tank: Order of Steps

1. Choose a cool spot away from sunlight, and confirm you can hold the water under about 68 F (20 C) all year, with a plan for summer.
2. Set up the tank with a bare bottom or fine sand, smooth hides and a baffled, gentle filter.
3. Fill with dechlorinated water and cycle the tank until ammonia and nitrite read zero and nitrate appears. This typically takes several weeks.
4. Check temperature and parameters for a few days before the animal arrives.
5. Float the transport bag briefly to match temperature, then release the animal gently without pouring in shop water.
6. Offer food after a day or two, starting with small worms.

Keepers who skip the cycle often see ammonia burns in the first weeks, which is one of the most common causes of early losses. Buying from a reputable captive breeder also reduces the risk of disease and genetic problems. Because the species is critically endangered in its native lakes, captive-bred animals should never be released into the wild.

Colour morphs

Axolotls are sold in several morphs, including wild-type (dark brown or olive), leucistic (pale pink with dark eyes), albino (golden or white with pink eyes), melanoid (dark) and others. Care requirements are identical across morphs. Subdued lighting and shade from plants suit all morphs.

Frequently Asked Questions

Is an axolotl a fish?

No. It is an amphibian, a type of salamander that keeps its larval features such as external gills throughout adulthood. It breathes through gills, skin and sometimes gulps air at the surface.

What temperature should an axolotl tank be?

Aim for 60 to 64 F (16 to 18 C), with up to about 68 F (20 C) acceptable. Above roughly 72 F (22 C) the animal becomes stressed and prone to illness. A heater is not needed.

How long do axolotls live?

Typically about 10 to 15 years in captivity. Cool, clean water and a suitable diet are the main factors in reaching that age.

Can axolotls live with fish?

Generally not. Fish may nip the gills, and axolotls will eat small fish. Most tropical species also need warmer water than axolotls tolerate, so the combination fails on temperature alone.

What tank size does an axolotl need?

A 20-gallon long is often cited as the minimum for one adult, while many keepers favour 29 to 40 gallons for easier water stability. Long and wide matters more than tall.

What should I feed an axolotl?

Earthworms or nightcrawlers are a staple, supplemented with sinking salamander or axolotl pellets and the occasional bloodworm. Avoid feeder fish because of parasite risk.

Can I touch my axolotl?

Avoid it where possible. Their skin is delicate and easily damaged, and handling causes stress. If you must move one, use a soft net or a container filled with tank water.

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