Axolotl Care: Why This Cute Salamander Is Harder Than It Looks

An axolotl looks like a cartoon, but it needs cold, clean, carefully managed water. Before you buy one, plan for a cycled tank kept at about 60 to 64°F, gentle filtration, no swallowable gravel, minimal handling, and a check of your state's rules. Here is what veterinary sources say.

Axolotl Care: Why This Cute Salamander Is Harder Than It Looks
Photo: MutantRainbow / Wikimedia Commons. Public domain.

The axolotl in the store tank seems to smile. Its feathery gills sway, and it barely moves. It looks like the easiest pet in the room.

The hard part is invisible: the water. An axolotl lives in it, breathes through it, and absorbs whatever is dissolved in it.

This guide explains what an axolotl needs, what goes wrong most often, and the legal and conservation questions to check before you bring one home.

What is an axolotl?

A fully aquatic salamander that keeps its larval features for life. The axolotl, Ambystoma mexicanum, is a mole salamander from Mexico. Unlike most salamanders, it usually never leaves the water. Adults keep the external gills and finned tail of a larva, and they breathe through gills, lungs, and skin.

In the wild, AmphibiaWeb reports that it lives only in Lake Xochimilco and Lake Chalco, in the Mexico City area, and much of that habitat has been lost. Drainage, pollution, introduced fish, and the growth of the city have pushed it to the edge. It is listed as Critically Endangered on the IUCN Red List and is included in CITES Appendix II, which regulates international trade.

The axolotls sold as pets are a different story. VCA Animal Hospitals and LafeberVet note that most pet axolotls come from captive-bred stock. Buying a captive-bred animal does not take one from the wild, but it does not help wild axolotls either.

How big do axolotls get, and how long do they live?

Usually about 9 to 12 inches, and often 10 to 15 years. VCA and LafeberVet say most adults reach about 9 to 10 inches (23 to 25 cm). The Royal Veterinary College (RVC) in London gives an average of 25 to 30 cm (about 10 to 12 inches), with some reaching 35 cm (about 14 inches).

VCA and LafeberVet give a captive life span of 10 to 15 years. The RVC says 10 to 12 years is common and that some live past 20. That is a long commitment for a pet that depends on daily water care.

What water temperature does an axolotl need?

Cool water, about 60 to 64°F (16 to 18°C), and never above 75°F (24°C). LafeberVet and the RVC agree on this range. VCA warns that water above 75°F makes axolotls sluggish, LafeberVet adds that warm water can cause loss of appetite, uncontrolled floating, and bacterial infection, and VCA says warm water makes axolotls more prone to bacterial and fungal infections.

This is the opposite of most tropical aquarium fish. Many homes run warmer than 64°F for part of the year, so a tank near a sunny window, a heater, or a warm appliance can overheat. The Merck Veterinary Manual's professional guidance notes that salamanders generally prefer much cooler temperatures than frogs, and that water chillers or air conditioning may be needed.

Do not add an aquarium heater unless your veterinarian asks you to. Check the temperature daily with a thermometer in the water.

Why is water quality so important?

Because axolotls absorb what is in the water through their skin and gills. The Merck Veterinary Manual says amphibian water must be free of chlorine, ammonia, nitrite, pesticides, and heavy metals.

Ammonia comes from waste and leftover food. In an established tank, beneficial bacteria turn ammonia into nitrite and then into less toxic nitrate. This process is called the nitrogen cycle, and a new tank does not have it yet. LafeberVet recommends cycling the aquarium for several weeks before the axolotl arrives.

LafeberVet's water targets are:

  • Ammonia and nitrite: 0 ppm.
  • Nitrate: below 10 ppm.
  • pH: about 7.4 to 7.6 (the RVC gives the same range).
  • Chlorine and chloramine: always removed.

Merck recommends testing temperature, pH, hardness, ammonia, nitrite, and nitrate weekly with an aquarium kit. Many US water systems use chloramine, which does not evaporate the way chlorine does, so use a dechlorinator that is labeled for chloramine. Do not use distilled water; Merck advises against it for amphibians.

Partial water changes keep waste from building up. Sources differ on the amount: Merck says at least 10% weekly, the RVC says 10% to 20%, and LafeberVet about 30%. Your test results are the best guide.

What tank, filter, and substrate are safest?

A roomy tank, a gentle filter, and nothing on the bottom small enough to swallow.

  • Tank size: LafeberVet suggests a 10-gallon aquarium for a juvenile and at least 20 gallons for an adult.
  • Filter: axolotls prefer still or slow water. The RVC calls strong flow a severe cause of stress, and VCA warns that forceful flow can damage the external gills.
  • Substrate: axolotls swallow almost anything that fits in their mouth. LafeberVet, VCA, and the RVC all warn that swallowed gravel can cause a blockage that may be fatal. The RVC recommends sand. Merck's rule is that any gravel must be too large to swallow or small enough to pass.
  • Light and hiding places: VCA recommends keeping the lighting dim. Give the axolotl a place to hide.

For general amphibian setup mistakes, see our care and habitats section.

What do axolotls eat, and how often?

Meaty foods, offered daily to juveniles and every two to three days to adults. VCA and the RVC list earthworms, bloodworms, blackworms, brine shrimp, and salmon pellets.

  • Juveniles: feed daily (VCA, LafeberVet).
  • Adults: every 2 to 3 days (VCA), or 2 to 3 times a week (LafeberVet).
  • Portion: only what the axolotl eats in a few minutes. VCA says 2 to 5 minutes; LafeberVet says 2 to 3.

VCA warns that feeding too much or too often can cause obesity. Leftover food also breaks down into ammonia, so remove what is not eaten. Ask your veterinarian whether your axolotl needs a supplement; the RVC suggests dusting food with calcium.

Can you handle an axolotl or give it tankmates?

Handle it only when necessary, and keep fish out of the tank. LafeberVet says not to handle axolotls unless absolutely necessary, and the RVC notes that their skin is vulnerable to toxins. VCA warns that rough handling can cost an axolotl a limb. Axolotls can regrow limbs, but it may take months.

LafeberVet advises housing axolotls without fish: small fish may be eaten, and larger fish can nip the gills. Juveniles can be cannibalistic, and the RVC says axolotls of different sizes should not be kept together. Sources disagree on adults: LafeberVet says adults can often share a large tank with hiding places, while the RVC says axolotls are best housed alone. If you are unsure, one axolotl per tank is the lower-risk choice.

Is it legal to keep an axolotl where you live?

It depends on your state, and federal rules now cover the whole genus. This section is a summary, not legal advice. Check with your state wildlife agency before buying.

  • Federal: in January 2025, the U.S. Fish and Wildlife Service added the genus Ambystoma, which includes the axolotl, to its injurious wildlife list through an interim rule because of the risk of salamander chytrid fungus. The agency says the listing does not affect ownership, and no federal permit is needed to move a pet across state lines within the continental United States. Importing listed salamanders into the US and shipping them between the continental US and Hawaii, Washington, DC, Puerto Rico, or other US territories are prohibited without a federal permit, and release into the wild is prohibited. As of a September 2025 agency bulletin, the rule was still interim, so check for updates.
  • California: the state's restricted species regulation lists the genus Ambystoma (nonnative tiger salamander group) as detrimental, without naming the axolotl. Axolotls are widely treated as requiring a permit there, so confirm with the California Department of Fish and Wildlife.
  • Maine: lists the axolotl by name as a Category 2 restricted species that requires an exhibitor's or rehabilitator's permit.
  • New Jersey: requires a permit for exotic amphibians that are not on its exempt list, and the axolotl is not on that list.
  • Washington, DC: its code allows only listed animals as pets, and amphibians are not on the list.
  • Virginia: the current regulation specifically exempts the Mexican axolotl from its permit rule for mole salamanders, even though some websites say otherwise.

Rules change, and cities and counties can add their own. Never release an axolotl or pour tank water outdoors.

Which signs mean your axolotl needs a veterinarian?

Most problems start with water, temperature, or something swallowed. Contact a veterinarian who treats amphibians if you notice:

  • Loss of appetite, or floating that the axolotl cannot control.
  • Bulging eyes. VCA links this to excess nitrite, and LafeberVet to prolonged high nitrate.
  • Red patches on the legs or belly, or swelling. Merck lists these as signs of red-leg syndrome, an infection often caused by bacteria.
  • White, cotton-like growths on the skin or gills, a sign of fungal infection that Merck notes affects aquatic species.
  • Pale or grayish skin or excessive shedding, which Merck lists among the signs of chytrid fungus infection.
  • A swollen belly, straining, or no droppings after the axolotl may have swallowed gravel.

Test the water first and bring the results to the visit. Do not add medications or salt to the tank without veterinary advice.

Like other amphibians, axolotls can carry Salmonella without looking sick. The CDC advises that children under 5 should not touch amphibians or their tanks, and notes that children under 5, adults over 65, and people with weakened immune systems are more likely to get sick. Everyone should wash hands with soap and water after contact, and tanks and equipment should never be cleaned in food preparation areas.

Quick facts: scientific name Ambystoma mexicanum; family Ambystomatidae; native only to Lakes Xochimilco and Chalco, Mexico; Critically Endangered in the wild; fully aquatic; usually 9 to 12 inches long; often lives 10 to 15 years in captivity.

The bottom line

An axolotl is a water-quality pet more than an animal you handle. Cycle the tank for several weeks first, keep the water at about 60 to 64°F and never above 75°F, remove chlorine and chloramine, and test the water every week. Use a gentle filter and sand or no loose gravel, and feed adults every two to three days.

Before buying, confirm that axolotls are legal where you live, and plan for 10 to 15 years of care. Never release one. If your axolotl stops eating, floats, or shows red or cottony skin, test the water and call an amphibian veterinarian.

Sources & further reading

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