🦎 How to Set Up an Axolotl Tank (Keep It Cold!)

An axolotl is a captivating, fully aquatic amphibian with a permanent smile and feathery gills — and the golden rule for keeping one is right in the name of this guide: keep it cold. Axolotls are cool-water animals that suffer in warm homes, so temperature is the first thing to plan and the thing you will watch most closely. Set up cold, clean, gentle water, and an axolotl is a remarkably charming and rewarding pet.

Tank size

For a single axolotl, start with a 20 gallon long tank or larger. Axolotls are fully aquatic and do not need a land area at all, so the whole tank is swimming and resting space. A longer footprint gives your axolotl more floor to walk along the bottom, which is where it spends most of its time. Bigger tanks also hold a more stable temperature and stay cleaner, both of which help your axolotl thrive.

Keep the water cold

Cold water is everything for an axolotl. The best range is roughly 60–64°F, and axolotls become stressed or ill above about 68°F. Keep the tank out of warm rooms and away from direct sun, and never use an aquarium heater. If your home runs warm, plan ahead: a fan blowing across the water surface can help a little, and an aquarium chiller is the reliable answer in genuinely hot homes. Keep a thermometer in the tank and check it often, especially in summer.

What goes on the floor

The tank bottom needs careful thought. Use fine aquarium sand or leave the bottom bare — never gravel. Gravel is dangerous because axolotls hunt by gulping, and they will swallow small stones, which can cause a life-threatening blockage called impaction. Fine sand passes safely, and a bare bottom is easy to keep clean. This one choice prevents one of the most common and serious axolotl emergencies.

Filtration and hides

Axolotls dislike strong currents, so use a gentle, low-flow filter that keeps the water clean without whipping it around. If your filter outflow is strong, baffle it so the water stays calm. Add a few caves or hides where your axolotl can tuck away and feel secure, since they appreciate shady resting spots during the day. Calm water and good hiding places make for a relaxed, confident axolotl.

Water and feeding

Always use dechlorinated water, and let the tank go through a proper cycle before your axolotl moves in, so beneficial bacteria are established to keep the water safe. For food, good staples include earthworms or nightcrawlers and axolotl pellets, fed in portions your axolotl can finish. Remove leftovers so they do not foul the water. One gentle reminder: axolotls have delicate gills and soft bodies, so this is a watch-and-admire pet — clean, cold, calm water does far more for its health than handling ever could.

Quick setup checklist

• A 20 gallon long tank or larger for one axolotl — fully aquatic, no land needed
• Cold water, best at 60–64°F; trouble starts above about 68°F
• Keep it out of warm rooms and sun; use a fan or chiller if needed, and never a heater
• Fine aquarium sand or a bare bottom — never gravel, which causes impaction
• A gentle, low-flow filter and a few caves or hides
• Dechlorinated, fully cycled water
• Feed earthworms or nightcrawlers and axolotl pellets, removing leftovers

Axolotls share the cool, clean-water world of other amphibians — if you like this style of pet, our newt tank setup guide is a natural next read, or take our free pet quiz to find your ideal match.

🛒 Recommended supplies

Hand-picked gear for this guide. Affiliate links — we may earn a commission. The $/$$/$$$ badges are a rough budget guide, not live prices.

🧽 Cleaning & maintenance

Axolotls are sensitive to water quality, so gentle, consistent maintenance matters more than scrubbing. Spot-siphon uneaten food and waste daily — they are messy eaters and rotting food spikes ammonia fast — and do a 20% water change a couple of times a week with cool, dechlorinated water, pouring it in gently so you do not chill or stress them. Rinse the sponge filter in old tank water only, never tap water. Keep the water cold (60–64°F); if a heat wave pushes it warm, float frozen water bottles or run a fan rather than ever adding a heater. A turkey baster is the perfect tool for spot-cleaning around their delicate gills, and never use soaps or chemicals near the tank.

Cleaning supplies for this habitat. Affiliate links — we may earn a commission. The $/$$/$$$ badges are a rough budget guide, not live prices.

❓ Common questions