Axolotl Questions, Answered: Is My Axolotl Okay?

By The Bognook Team · written & researched by amphibian keepers 🔍 Keeper-reviewed for accuracy

If you’re here worried about your axolotl — you’re in the right place, and there’s no such thing as a dumb question. Below are honest answers to the things keepers actually ask, starting with the one everyone worries about: is my axolotl okay?

🔧 Not sure if the water’s the problem? Paste your readings into the free water interpreter — most axolotl trouble is really water trouble.

Health & “is this normal?”

The most-asked, most-worried-about questions. Deep breath — most of this is fixable.

How do I know if my axolotl is healthy or sick?

A healthy axolotl has full, fluffy gills, all four legs and toes, clear skin, and a good appetite, and it rests calmly on the bottom.

  • Warning signs to act on: gills curling forward or shrinking, not eating for over a week, floating or unable to stay upright, cotton-like fuzz (fungus), red or irritated skin, or gulping at the surface.
  • Many early problems trace back to water quality or temperature — check those first.

Why are my axolotl’s gills curling forward (or shrinking)?

Forward-curling gills are a stress sign — and strong filter flow is one known cause.

  • Test the water (ammonia and nitrite should be 0) and check the temperature is 16–18°C / 60–64°F.
  • Reduce filter flow if it’s strong. Gills that shrink or look ragged over time are an early sign of illness — poor water quality and strong flow can both damage them — so fix the water and the flow, and see an exotics vet if they keep getting worse.

My axolotl has white cotton-like fluff — is it fungus?

Cotton-like tufts on the gills or body are almost always a fungal infection, usually triggered by stress, warmth, or poor water.

  • First aid: improve water quality, make sure it’s cool, and many keepers “tub” (daily 100% water changes in a clean container).
  • For anything beyond mild, or if it spreads, contact an exotics vet. Don’t panic — caught early, fungus is very treatable.

Why is my axolotl floating and can’t stay upright?

Floating is usually trapped gas or constipation, and it’s often linked to water that’s too warm.

  • Cool the tank and reduce stress. A short “fridging” or tubbing period in cool, clean water is a common first step.
  • If it persists more than a couple of days or the belly looks swollen, get vet advice.

Why won’t my axolotl eat?

Often it’s water that’s too warm or a water-quality problem — stress kills their appetite fast.

  • Check temperature (under ~20°C) and test ammonia/nitrite (both 0).
  • Offer a wriggling earthworm at night. A few days off food isn’t an emergency; a week-plus with bad water is.

My axolotl lost a limb or gill — will it grow back?

Yes. Axolotls are famous for regeneration — limbs, gills, even parts of organs regrow.

  • A limb can take weeks to months to fully regrow, faster in younger animals.
  • Keep the water pristine while it heals to prevent infection.

Tank, water & temperature

Get these right and most “health” problems never happen.

What temperature do axolotls need? Do they need a heater?

Axolotls are cold-water animals: keep them at 16–18°C (60–64°F), and never use an aquarium heater. Above about 22–24°C (72–75°F) they get stressed and sick. In summer, cool with a fan across the surface or a chiller.

What size tank does one axolotl need?

A minimum of 20 gallons long for one adult, adding about 10 gallons per extra axolotl. Floor space matters more than height — they live on the bottom. Bigger water volume = more stable, forgiving water.

How do I know if my tank is cycled?

A cycled tank reads 0 ammonia and 0 nitrite, with some nitrate, on a liquid test kit — and holds those readings after feeding. Never add an axolotl to an uncycled tank. Fishless cycling takes about 4–8 weeks.

Is gravel safe? What substrate should I use?

No — gravel is dangerous. Axolotls swallow it and get fatal impactions. Use bare-bottom or fine sand only.

Do axolotls need light or UVB?

No UVB, and keep lighting dim — axolotls have no eyelids and dislike bright light. Give them shaded hides and caves.

What filter should I use, and will medications kill my cycle?

Use gentle filtration (a sponge or baffled filter) — strong flow exhausts them. And yes, some medications (especially antibiotics/anti-parasitics) can harm your beneficial bacteria. If you medicate the main tank, watch your parameters closely, or treat in a separate tub.

Feeding, tankmates & handling

What do axolotls eat, and how often?

Earthworms/nightcrawlers are the gold-standard staple, with soft sinking pellets as a backup. Feed juveniles daily and adults every 2–3 days.

Can axolotls live together, or with fish?

Keep them alone or with similarly sized axolotls, and never with fish — fish nip their gills, carry disease, and may be eaten. Even two axolotls can nip each other, especially when young or different sizes.

Can I hold my axolotl?

Best not to — their bodies are soft cartilage with a delicate slime coat. Look, don’t touch. If you must move one, guide it into a soft container underwater rather than lifting it out.

Getting one & cost

Are axolotls good for beginners, or hard to keep?

They’re hardy and beginner-friendly if — and only if — you get the cold water and cycled tank right. Most “axolotl problems” are really water problems.

How much does an axolotl setup actually cost?

The setup costs far more than the animal — budget for the tank, filter, test kit, and a summer cooling plan, not just the axolotl.

Sources & further reading

💚 A gentle reminder: if something feels wrong and you’re scared, cool the water, keep it clean, and reach out to an exotics vet or a kind keeper community. Most problems, caught early, are fixable. You’re already a good keeper for looking this up.

Go deeper: the complete Axolotl Care Guide · how to tub & fridge an axolotl · accidental axolotl eggs — what to do · the printable care sheet.

Common questions

How do I know if my axolotl is healthy or sick?

A healthy axolotl has full, fluffy gills, all four legs and toes, clear skin and a good appetite, and rests calmly on the bottom. Warning signs: gills curling forward or shrinking, not eating for over a week, floating, cotton-like fungus, or red skin. Most early problems trace back to water quality or temperature, so check those first.

Why are my axolotl gills curling forward or shrinking?

Forward-curling gills are a stress sign, and strong filter flow is one known cause, so turn the flow down or baffle it first. Then test the water (ammonia and nitrite should be 0) and confirm the temperature is 16 to 18C (60 to 64F), because warm or dirty water stresses axolotls too. Gills that shrink or look ragged over time are an early sign of illness, so if they keep getting worse, see an exotics vet.

My axolotl has white cotton-like fluff. Is it fungus?

Cotton-like tufts on the gills or body are almost always a fungal infection, usually triggered by stress, warmth, or poor water. Improve water quality, keep it cool, and consider tubbing (daily 100% water changes in a clean container). For anything beyond mild, contact an exotics vet. Caught early, fungus is very treatable.

Why is my axolotl floating and unable to stay upright?

Floating is usually trapped gas or constipation, often linked to water that is too warm. Cool the tank and reduce stress; a short fridging or tubbing period in cool, clean water is a common first step. If it persists more than a couple of days or the belly is swollen, get vet advice.

Why won't my axolotl eat?

Often the reason is water that is too warm or a water-quality problem, since stress kills their appetite. Check the temperature is under about 20C and test ammonia and nitrite (both 0). Offer a wriggling earthworm at night. A few days off food is not an emergency; a week-plus with bad water is.

My axolotl lost a limb or gill. Will it grow back?

Yes. Axolotls are famous for regeneration and regrow limbs, gills, and more. A limb can take weeks to months to fully regrow, faster in younger animals. Keep the water pristine while it heals to prevent infection.

What temperature do axolotls need? Do they need a heater?

Axolotls are cold-water animals: keep them at 16 to 18C (60 to 64F) and never use an aquarium heater. Above about 23C (74F) they get stressed and sick. In summer, cool with a fan across the surface or a chiller.

What size tank does one axolotl need?

A minimum of 20 gallons long for one adult, adding about 10 gallons per extra axolotl. Floor space matters more than height because they live on the bottom, and more water volume is more stable and forgiving.

How do I know if my tank is cycled?

A cycled tank reads 0 ammonia and 0 nitrite with some nitrate on a liquid test kit, and holds those readings after feeding. Never add an axolotl to an uncycled tank. Fishless cycling takes about 4 to 8 weeks.

Is gravel safe for axolotls? What substrate should I use?

No, gravel is dangerous. Axolotls swallow it and get fatal impactions. Use a bare bottom or fine sand only.

Do axolotls need light or UVB?

No UVB, and keep lighting dim. Axolotls have no eyelids and dislike bright light, so give them shaded hides and caves.

What filter should I use, and will medications kill my cycle?

Use gentle filtration such as a sponge or baffled filter, because strong flow exhausts them. Some medications, especially antibiotics and anti-parasitics, can harm beneficial bacteria, so watch your parameters closely or treat in a separate tub.

What do axolotls eat, and how often?

Earthworms and nightcrawlers are the gold-standard staple, with soft sinking pellets as a backup. Feed juveniles daily and adults every 2 to 3 days.

Can axolotls live together, or with fish?

Keep them alone or with similarly sized axolotls, and never with fish, which nip their gills, carry disease, and may be eaten. Even two axolotls can nip each other, especially when young or different sizes.

Can I hold my axolotl?

Best not to. Their bodies are soft cartilage with a delicate slime coat, so look but do not touch. If you must move one, guide it into a soft container underwater rather than lifting it out.

Are axolotls good for beginners, or hard to keep?

They are hardy and beginner-friendly if you get the cold water and cycled tank right. Most axolotl problems are really water problems.

How much does an axolotl setup actually cost?

The setup costs far more than the animal. Budget for the tank, filter, test kit, and a summer cooling plan, not just the axolotl.