By Dr Duncan Houston
An axolotl is an aquatic salamander, not a lizard. Its delicate skin and external gills make water conditions central to everyday care, and clear-looking water can still contain harmful waste chemicals.
Set up a stable aquarium before bringing an animal home and identify a veterinarian who treats amphibians before you need urgent help.
Quick Answer
Keep an axolotl in a spacious, fully cycled freshwater aquarium with gentle filtration, secure hides and consistently cool water. Aim for about 16 to 18°C, with zero detectable ammonia and nitrite. Offer suitable complete sinking pellets and appropriately sourced earthworms, remove waste promptly and check water readings when behaviour changes. Persistent floating, skin damage, marked appetite loss or weakness needs veterinary advice.
Build the aquarium around the animal
Prioritise floor space for walking and turning, not just tank height. A long aquarium of about 75 litres is a starting minimum for one adult, with more space offering room for hides and greater water stability. Larger animals and individual setups may need more. A small tank is harder to keep clean and cool.
Provide smooth shelters, subdued lighting and a secure lid. Avoid sharp ornaments and small gravel that can be swallowed. A bare bottom is straightforward to inspect and clean, particularly for juveniles. Fine sand requires careful selection for the animal’s size and feeding behaviour; no substrate is automatically risk-free.
Use a low-flow filter and establish biological filtration before adding the axolotl. Running a new filter for a day does not prove the aquarium is cycled. Beneficial microbes process nitrogenous waste, so repeated complete cleaning or replacing all filter media can disrupt the system.
Measure water rather than judging its appearance
| Parameter | Practical aim |
|---|---|
| Temperature | Stable, cool water around 16 to 18°C; plan cooling before hot weather. |
| Ammonia and nitrite | Zero detectable on suitable aquarium tests. |
| Nitrate | Keep low through waste removal and partial water changes; track increases between changes. |
| pH | Typically 6.5 to 8, with stability rather than repeated chemical adjustments. |
| Chlorine and chloramine | Absent from water added to the aquarium. |
The University of Kentucky axolotl husbandry resource describes the importance of cool water and suitable water chemistry. Use an aquarium thermometer and liquid test kit. Check an established tank at least weekly and more frequently after setup changes, abnormal results or illness.
Use a conditioner appropriate for your water supply, including chloramine if present; simply leaving tap water to stand is not reliable for chloramine. Do not use unmodified distilled water as the default. Match replacement water temperature and adjust partial water-change frequency to actual readings, tank load and waste, rather than following a fixed calendar alone.
Feed a carnivorous amphibian appropriately
Choose complete sinking pellets intended for axolotls and suitable earthworms from a reliable, pesticide-free source. Match food size to the animal. Bloodworms alone do not make a balanced lifelong diet, and pieces of mammalian meat should not replace an appropriate ration.
Growing juveniles usually need more frequent feeding than adults. Many adults eat every two or three days, but body condition, portion size and health matter more than rigid scheduling. Watch swallowing and remove uneaten food before it degrades the water. Tree of Life Exotic Pet Medical Center’s care guidance covers suitable foods and aquarium conditions.
When a change needs action
Appetite loss, damaged gills, unusual floating, redness and white growth can result from several problems, including poor water quality, injury, infection or swallowed material. A curled gill or tail alone does not identify a disease. Take photographs and record the temperature, test results, feeding history and recent changes for your vet.
Check water conditions immediately when something looks wrong. If ammonia or nitrite is present, begin an appropriate partial change with conditioned, temperature-matched water and seek advice about correcting the filtration problem. Do not repeatedly add chemicals to chase a number.
When is this an emergency?
Severe weakness, inability to right itself, major wounds, bleeding, pronounced swelling or rapid deterioration require urgent veterinary contact. Persistent inability to submerge, worsening skin lesions or a substantial appetite change also need prompt assessment. Do not wait a fixed week before asking for help, especially with a young animal or additional signs.
Keep the animal aquatic and minimise handling while arranging care. Ask the clinic for transport instructions. Do not improvise salt baths, refrigeration, copper treatments or fish medications; the cause and a safe amphibian-specific treatment must be established.
Prevent avoidable stress
Use a reliable cooling plan such as an appropriately installed chiller where needed. If water approaches 22°C, address overheating promptly without sudden temperature shocks. Avoid relying on repeated ice-bottle changes that cause large swings.
Housing alone avoids competition and bite injuries. Fish may nip gills or be swallowed. Hides and a calm environment provide useful choice without adding tankmates. Clean equipment carefully and keep soap, aerosols and household chemicals away from the water.
Frequently asked questions
Does clear water mean safe water?
No. Ammonia and nitrite require testing; they are not reliably detected by appearance or smell.
Can an axolotl live on land?
Pet axolotls are aquatic. Do not remove one from water for routine play or handling.
Is white fluff always a fungal infection?
No. Appearance alone is insufficient to choose treatment. Have lesions assessed while checking the aquarium conditions.
Will an injured limb simply grow back?
Regenerative ability does not remove the need to assess pain, infection, blood loss or the cause of injury.
Make stability the daily goal
A simple care log helps you notice changes before they become crises. Clean, cool water and early assessment of abnormalities give your veterinarian useful information and your axolotl a better-supported care plan.
For help making sense of your animal’s care needs, explore ASK A VET™. Contact your veterinarian directly for urgent concerns.
The ASK A VET™ Tracker logs live location and activity trends, so a change in routine never goes unnoticed.
- Amphibians
- Aquatic Pet Care
- Axolotls
- Exotic Animal Care
- Pet Health
Every ASK A VET article is written and reviewed by qualified veterinarians.
