How do I take care of an axolotl?

At a glance

What you're signing up for

First, the law. Axolotls are illegal to own in California, Maine, New Jersey, and Washington D.C. Hawaii and New Mexico require permits. Check your state before you fall in love with one, because "I didn't know" does not get the animal back. California and Maine class them as detrimental animals that threaten native salamanders; New Jersey's ban exists to prevent breeding with the native tiger salamander. California issues no pet permits at all. Cities and counties can add their own rules on top, so check locally too. And never, ever release one — hybridization with native salamanders is exactly what the bans are trying to prevent.

Second, what an axolotl actually is. It is a fully aquatic salamander — a water animal that must never leave water. It has permeable skin and external gills, and handling damages its protective slime coat and stresses it badly. The care consensus is plain: do not pet it, do not hold it, do not take it out of the water. If you must move it, use a soft fine-meshed net. Chewy's care sheet calls axolotls "primarily display animals," and that is the honest job description. If you or your kids want a pet to touch, this is not it.

Third, the commitment. Chewy puts captive lifespan at 10-15 years with good care — roughly triple the wild figure of about 5 years. That is a decade-plus of daily temperature checks and weekly water changes. The animal is often described as hardy, and it is, but only for keepers who already understand two aquarium fundamentals: the nitrogen cycle and temperature control. Both are covered below, and both are non-negotiable.

Housing

Tank. 30 gallons minimum; many experts recommend at least a 40-gallon breeder tank — low and wide, because an axolotl walks the bottom. Floor space matters more than height. Adults reach up to 12 inches long. One cost guide baselines its budget build on a 20-gallon tank; that is below the 30-gallon minimum, so don't copy it.

Temperature — the classic killer. Axolotls need stable water at 60-68°F, and no heater, ever. If you keep tropical fish, unlearn the habit: a heater in an axolotl tank is a mistake, not an upgrade. Heat stress is the most common way these animals die. Hobbyist guidance treats water sitting near or above 70°F as a stress emergency; aim for the low-to-mid 60s. In a US home that runs above about 70°F in summer without air conditioning, the honest advice is to budget for an aquarium chiller — a refrigeration unit that cools tank water. Chewy prices one recommended model, the JBJ Aquarium Arctica, at $532, which makes it the single biggest line in the whole setup. The cheap stopgaps — clip-on fans and frozen water bottles — work, but they are labor-intensive and imprecise. Decide your summer plan before you buy the animal, not during the first heat wave.

Substrate — no gravel, full stop. Substrate is the material on the tank floor. Axolotls suck food in and swallow whatever comes with it. Gravel gets swallowed and causes impaction — a blockage that is a common surgical or fatal emergency. Use fine sand or a bare bottom. Nothing in the tank should fit in the animal's mouth unless it's food.

Cycling — do it before the axolotl exists in your house. "Cycling" means running the tank for weeks until colonies of beneficial bacteria establish and convert ammonia (from waste) into less toxic compounds. The tank must be fully cycled before the axolotl goes in. An uncycled tank means ammonia burns on a fully aquatic amphibian that lives in, and breathes through, that water. After cycling: weekly water changes and strong filtration, keeping nitrates below 20 ppm. You will need a water test kit and you will actually use it.

Flow and light. Axolotls come from still water. Use gentle filtration — a canister or sponge filter tuned low — because a strong current is constant stress. Keep lighting subdued; they have no eyelids.

Feeding

Axolotls are carnivores. The staple is earthworms and nightcrawlers, plus small fish and mollusks, with axolotl-specific sinking pellets as a backup. Juveniles eat daily; adults eat every 2-3 days. Food must sink and must be small enough to swallow whole — oversized food causes the same impaction risk as gravel.

The live-food warning matters here as much as anywhere: live foods can carry parasites that infect your axolotl. Culture your own worms or buy from reputable vendors; freeze-dried options are a disease-free alternative. Pet-store feeder fish are a documented parasite risk — the same warning veterinarians give for all aquatic pets.

Never feed: - Pet-store feeder fish of unknown origin (parasite carriers) - Anything too big to swallow whole (impaction) - Floating foods that lure the axolotl to gulp at the surface - Live food from unverified sources

Health

Almost every axolotl health problem is a water problem wearing a costume. The three to know:

Fungal infections (Saprolegnia). Grey, white, or tan-brown fuzzy growths, like cotton, on the head or gills, sometimes with loss of the gill stalks. Triggers are poor water conditions, stress, injuries, and warm water suppressing the immune system. Treatment starts with fixing the root cause — usually temperature or water quality — plus salt baths or potassium permanganate, with a vet for serious cases.

Impaction. From gravel or oversized food. Prevention is the whole game: sand or bare bottom, right-sized food.

Heat stress. Water creeping past 68-70°F compromises the immune system and invites everything else. The thermometer is your most important piece of diagnostic equipment.

Handwashing after tank maintenance is standard amphibian hygiene, per CDC reptile-and-amphibian guidance — no axolotl-specific outbreak is on record, but wash anyway.

Go to a vet today if: - Fuzzy cotton-like growths on skin or gills - A swollen belly plus refusal to eat (possible impaction) - Gills shrinking, curling forward, or losing their filaments - Floating uncontrollably or gasping at the surface - Skin damage, or fungus that persists after water conditions are fixed

What it really costs

The animal: $30-$100 for common colors; special pigmentations run about $300-$1,500 (one Enigma morph quoted at $1,500), and shipping adds $40-$60.

Setup, per AquariumStoreDepot's build: tank $25-$100, canister filter from under $100 to $150+, sand $15-$25, lighting under $50, cooling fan $10-$15, decorations about $50, dechlorinator $10. They put a basic build at $200-$300, with a fuller range of $150-$600 before food. Two honest corrections to that: their baseline is a 20-gallon tank, below the 30-gallon minimum, so real setups land toward the top of the range — and none of it includes a chiller. Add the chiller in a warm home and the $532 unit becomes the biggest single purchase, bigger than everything else combined at the low end.

Ongoing: the food figures conflict, and we'll show you the conflict rather than pick a side. The same cost guide says $20-$30 a month on food in one place and about $50 a year for adults fed twice weekly in another. The difference likely comes down to live worms versus pellets and how often you feed. Budget toward the higher figure until you know your animal. Add water conditioner and test kits as recurring lines, a recommended annual vet visit (no published price), and the unquantified electricity of running a chiller through summer.

Daily and weekly routine

Daily - Check water temperature — must be 60-68°F, act if it's drifting up - Feed juveniles; feed adults on their every-2-3-days schedule - Remove uneaten food promptly - A quick look: gills full and feathery, skin clear, behavior normal

Weekly - Partial water change with dechlorinated, temperature-matched water - Test water: ammonia, nitrite, nitrates below 20 ppm - Spot-clean waste from the sand or bare bottom - Check filter flow is present but gentle

Monthly - Rinse filter media in tank water (never tap — chlorine kills the good bacteria) - Inspect equipment; verify thermometer accuracy - In warm season: confirm the cooling plan is actually holding temperature

Common mistakes

1. Gravel on the tank floor. Swallowed gravel causes impaction, a surgical or fatal emergency. Fine sand or bare bottom.
2. Skipping the nitrogen cycle. An uncycled tank means ammonia burns. Cycle fully first, then add the animal.
3. No summer cooling plan. Water past 68-70°F is a stress emergency. Decide fan/bottles/chiller before you buy.
4. Adding a heater out of tropical-fish habit. The range tops out at 68°F. No heater.
5. Handling the axolotl or taking it out of water. Permeable skin, damaged slime coat, real stress. Move only with a soft fine-meshed net.
6. Feeding pet-store feeder fish. Documented parasite carriers. Reputable vendors or home-cultured worms.
7. A strong filter current. Still-water animal. Gentle flow only.
8. Buying in a ban state. California, Maine, New Jersey, and D.C. prohibit ownership; Hawaii and New Mexico require permits. Check your state and city first.

Is this pet right for you?

A good fit if... - You already keep aquariums, or will genuinely learn cycling before buying - Your home stays cool, or you'll pay for a chiller without resentment - You want a strange, beautiful animal to watch for 10-15 years - You're comfortable with a pet you never touch

Think twice if... - You live in California, Maine, New Jersey, or D.C. — it's illegal, stop here - Your home runs warm in summer and a $532 chiller isn't in the budget - You or your kids want a pet to hold — this one must never leave the water - Weekly water testing sounds like a chore you'll skip by month three

Worth knowing

It regrows almost anything. Axolotls regenerate lost limbs, heart tissue, spinal cords, and even parts of their brains — without permanent scarring. Injury-site cells revert to a stem-cell-like state and rebuild.

Its genome is ten times yours. 32 billion base pairs — roughly 10 times the human genome, and the largest genome fully sequenced at the time of its 2019 assembly.

Almost extinct wild, thriving in tanks. An estimated 50 to 1,000 axolotls remain in the wild, all in the Xochimilco canals near Mexico City — while millions live in labs and homes. Captive-bred axolotls have survived reintroduction in Mexican conservation trials.

Named for a god. The name comes from the Aztec god Xolotl, who legend says disguised himself as a salamander. "Axolotl" translates roughly to "water monster" in Nahuatl.

It never grows up — on purpose. Axolotls keep larval traits for life: the feathery external gills, the tail fin, the webbed feet. The word for this is neoteny. They still have working lungs and can breathe through their skin.

Don't force the transformation. Rarely, an axolotl can metamorphose into a land-dwelling salamander form. Inducing it is harmful — it stresses the animal and shortens its life. Experts discourage it flatly.

Captivity triples its lifespan. About 5 years wild, 10-15 with good care in a tank. Few pets get a better deal from good husbandry — or a worse one from bad.

What you'll need

• 30-40 gallon breeder tank (low/wide) — welfare minimum; floor space over height for a bottom-walking animal
• Canister or sponge filter with gentle flow — strong filtration without current stress
• Aquarium chiller — required in homes above ~70°F in summer; heat is the classic killer
• Clip-on cooling fans — budget stopgap cooling for mild climates
• Fine sand substrate — the safe alternative to impaction-causing gravel
• Aquarium thermometer — daily checks against the 60-68°F range
• Water test kit (ammonia/nitrite/nitrate) — cycling and the weekly under-20-ppm nitrate check
• Water conditioner/dechlorinator — tap water is toxic untreated
• Soft fine-meshed net — the only acceptable way to move an axolotl
• Hides and smooth decorations — shelter and dim retreats for a lidless-eyed animal
• Axolotl-specific sinking pellets — backup staple to worms
• Live earthworms/nightcrawlers from reputable vendors — the staple food (advice-only) (buy this where you already shop — we don't sell it, on purpose)

Browse the store for the gear above.

Sources