Axolotl Care Guide: How to Keep Your Aquatic Salamander Happy and Healthy

With their feathery external gills, perpetual smile, and otherworldly appearance, axolotls look like they swam out of a fantasy novel. They're also one of the most rewarding aquatic pets you can keep — long-lived, deeply personable, and unlike anything else in the hobby.

But axolotls are not "weird fish." They're cold-water amphibians with very specific needs that differ from almost every fish you've ever kept. Get those needs right, and you'll have a happy salamander that can live for 10–15 years.

Meet the axolotl

Axolotls (Ambystoma mexicanum) are aquatic salamanders native to a single ancient lake system in Mexico City — Lake Xochimilco. In the wild they're critically endangered, but they thrive in captivity, where dedicated breeding has produced a stunning variety of color morphs. We carry a full range, including classic pink (leucistic), black melanoid, copper, GFP "glowie," axanthic, silver dalmatian, lucy, albino, lavender, golden, and wild-type.

The most unusual thing about axolotls is that they're neotenic — they keep their larval features (external gills, finned tail) for their entire lives and never undergo full metamorphosis the way most salamanders do. They live their whole lives in water.

Tank size and setup

Axolotls produce a lot of waste and need real swimming room.

• Minimum tank size for one adult: 20 gallons long.
• Recommended: 30–40 gallons for one adult, plus 10 extra gallons per additional axolotl.
• Long over tall. Axolotls live on the bottom and need floor space, not height.
• Lid required. They can climb glass and have been known to jump out.

Browse our glass aquariums and starter aquarium bundles.

Water parameters — the cold water rule

This is the single biggest difference between axolotls and tropical fish.

• Temperature: 60–68°F (16–20°C). Never above 72°F. Heat is the #1 killer of pet axolotls.
• pH: 7.4–7.6 (slightly basic)
• Ammonia: 0 ppm
• Nitrite: 0 ppm
• Nitrate: under 20 ppm
• GH: 7–14 dGH (moderately hard)
• KH: 3–8 dKH

Do NOT use a heater. Most homes are naturally fine in cooler months. In summer, you may need:

• A small fan blowing across the water surface (cools by evaporation)
• A clip-on tank cooler/chiller
• Frozen water bottles floated in the tank as an emergency measure
• Moving the tank to the coolest room in your home

Always use a water conditioner that removes chlorine, chloramine, and heavy metals. Browse our water conditioner collection.

Substrate — the most important rule in axolotl keeping

Axolotls feed by suction: they vacuum up food along with whatever's near it. Wrong substrate = impaction, which is often fatal.

• ✅ Bare bottom — safest option, especially for juveniles under 5 inches
• ✅ Fine aquarium sand — pool-filter sand or fine play sand, deep enough that they can't pick up individual grains (smaller than 1mm). This is the gold standard for adults.
• ❌ Gravel of any size — ingested gravel causes lethal impaction. Avoid completely.
• ❌ Large rocks or pebbles — same issue, plus crush hazards.

Browse fine sand options in our aquarium substrate collection.

Filtration

Axolotls produce heavy waste loads but hate strong currents.

• Sponge filter is ideal — gentle flow, excellent biological filtration, and dirt cheap to run. See our Aquarium Co-Op sponge filters and air pumps.
• Canister or HOB filter can work if you baffle the output and reduce flow with a spray bar. Our aquarium filtration collection has good options.

Strong current causes stress, curled gills, and tail curling — a classic sign of an unhappy axolotl.

Plants and decor

• Live plants: axolotls don't eat plants, but they can uproot delicate ones. Stick with hardy attached plants like Anubias, Java Fern, and Java Moss tied to driftwood or rock. Browse our live aquatic plants.
• Hides: at least one cave or shaded spot per axolotl. Terra cotta pots laid on their side work great.
• Lighting: axolotls don't have eyelids and prefer dim light. Floating plants, a tank cover, or a low-output light all help. Avoid bright lights.

Diet and feeding

Axolotls are carnivores and prefer to eat at the bottom.

Staple foods:

• Sinking axolotl pellets like our Sera Axolotl Wafers and Zoo Med Axolotl & Aquatic Newt Food — formulated specifically for them.
• Earthworms (nightcrawlers) — the single best food. High protein, high calcium, perfectly nutritious. Cut to bite size for juveniles.

Occasional treats:

• Frozen or live blackworms
• Frozen bloodworms (a few times a week max — high in fat)
• Frozen brine shrimp or daphnia (for juveniles)

Avoid:

• Feeder fish — risk parasites and disease
• Mealworms or crickets — exoskeleton is too hard, causes impaction
• Anything that lived in untreated water

Feeding schedule:

• Juveniles (under 6 inches): daily, until belly is gently rounded
• Sub-adults (6–10 inches): every other day
• Adults (10+ inches): 2–3 times per week

Feed using tongs or a turkey baster for accuracy. Remove uneaten food within 30 minutes.

Tank mates — keep it simple

Best tank mate: another axolotl of similar size, in a large enough tank.

That's it. Axolotls and fish are a bad combination:

• Small fish get eaten
• Larger fish nip axolotl gills (one of the most common causes of injury)
• Cold water is wrong for most tropical fish anyway

If you do keep multiple axolotls:

• Match sizes carefully — bigger axolotls will bite smaller ones' limbs (which thankfully grow back)
• Provide enough hides and floor space
• Watch carefully for limb or gill nibbling

Browse our full axolotl collection.

Maintenance routine

• Daily: check temperature, observe gills (should be full and feathery), spot-clean obvious waste
• Weekly: 20% water change in cycled tanks, test water parameters, wipe glass
• Monthly: rinse sponge filter in old tank water (never tap), trim plants, deep clean of decor

Shop our aquarium maintenance supplies.

Common axolotl problems

Curled or shrinking gills — usually too much flow or poor water quality. Baffle the filter, test water, do a partial water change.

Tail curling / floating sideways — stress signal. Check temperature (too warm?), ammonia, and flow.

Fungal infection (cotton-like fuzz) — common in stressed or injured axolotls. Daily salt baths (about 1 teaspoon non-iodized salt per gallon of dechlorinated water, 10–15 minutes) often clear it. Consult our fish medications for severe cases.

Impaction / not pooping — usually caused by gravel ingestion or feeding mistakes. A "fridging" protocol (cold, clean water in a tub in the fridge at 40–45°F for several days) often helps the axolotl pass blockages. Severe cases need a vet.

Floating belly-up — often a digestive issue or trapped gas. Reduce feeding, check water, consider fridging if persistent.

Bitten limbs or gills — axolotls regenerate body parts. Isolate the injured animal if possible and keep water pristine while it heals.

For serious illnesses, set up a hospital tank for treatment.

Frequently asked questions

Do axolotls need a heater?

No — the opposite. They need cool water (60–68°F) and a heater can kill them.

Can axolotls live with fish?

Not safely. Fish nip gills, axolotls eat small fish, and the temperature mismatch is hard on both.

How long do axolotls live?

10–15 years with proper care, with some living even longer.

Are axolotls legal where I live?

They're banned or restricted in some U.S. states (notably California, Maine, New Jersey, and Virginia). See our post on whether axolotls are legal in the U.S. for current details.

Why does my axolotl have a "smile"?

That's the natural shape of their mouth. It doesn't mean they're happy or unhappy — though a healthy axolotl looks alert with full gills.

Do axolotls really regrow body parts?

Yes. Axolotls can regenerate limbs, parts of their tail, gills, and even portions of organs and spinal cord. It takes weeks to months.

Can I keep an axolotl in a bowl?

No. Axolotls produce significant waste, need stable cool water, and need swimming room. A 20+ gallon tank is the minimum.

Do axolotls need a light?

No — they prefer dim conditions. A light is only needed if you're growing live plants, and even then, low output is best.

Ready to start your axolotl tank?

We carry one of the widest selections of captive-bred axolotl morphs anywhere — plus the food, filtration, and supplies you need to keep them thriving.

Browse our Axolotl collection, shop substrate and sponge filters, or contact us for help setting up your first axolotl habitat.