Natural Habitat
Axolotls are native only to Lake Xochimilco and Lake Chalco near Mexico City. Lake Chalco no longer exists, and Xochimilco has been severely degraded, making axolotls critically endangered in the wild. Fortunately, they breed readily in captivity, and the pet population is thriving.
Tank Setup
- Tank size: 20 gallons for one axolotl, 40+ gallons for two. Long tanks are preferred over tall ones.
- Temperature: 60–68°F — this is crucial. Axolotls are cold-water animals and will become stressed or ill above 72°F. A fan or aquarium chiller may be needed in warm climates.
- Substrate: Fine sand (after the axolotl is 6+ inches) or bare bottom. NEVER use gravel — axolotls swallow substrate while feeding and gravel causes fatal impaction.
- Filter: Sponge filter or low-flow canister. Axolotls hate strong current.
- No heater: Heaters are not needed and can be dangerous
- Hides: PVC pipes, terracotta pots, or aquarium caves. Axolotls like dark hiding spots.
- Lighting: Dim or none — axolotls have no eyelids and are sensitive to bright light
Water Parameters
- Temperature: 60–68°F (15–20°C) — NEVER above 72°F
- pH: 6.5–8.0
- Ammonia/Nitrite: 0 ppm (axolotls are extremely sensitive)
- Nitrate: below 20 ppm
Cycle your tank fully before adding an axolotl. They are very sensitive to water quality. Perform 20% water changes weekly.
Diet & Feeding
- Staple (adults): Earthworms (nightcrawlers) — the single best food for axolotls
- Alternatives: Hikari Sinking Carnivore Pellets, frozen bloodworms (for juveniles)
- Juveniles (under 6 inches): Frozen bloodworms, small earthworm pieces, live blackworms
- Frequency: Adults: 2–3 earthworms every 2–3 days. Juveniles: daily
Never feed live fish — they can introduce parasites and disease. Axolotls don't need variety the way fish do; earthworms alone provide complete nutrition.
Tank Mates
Best kept alone or with other axolotls of similar size. Axolotls will eat anything that fits in their mouth (including smaller axolotls). Fish will nip at their gills. Shrimp will be eaten. The only potentially safe tank mates are large snails, but even this is debated.
Regeneration
Axolotls have remarkable regeneration abilities and can regrow limbs, gills, parts of their heart, and even sections of their brain. Minor gill or limb damage in captivity typically heals within weeks with clean, cool water.
Frequently Asked Questions
Do axolotls need a chiller?
If your room temperature stays below 72°F year-round, no. If summer temperatures push water above 72°F, you'll need a clip-on fan (can drop temps 2–4°F) or an aquarium chiller.
Can axolotls live with fish?
No. Fish nip at axolotl gills, and axolotls eat anything they can swallow. Species-only tanks are strongly recommended.
How big do axolotls get?
Most pet axolotls reach 9–12 inches as adults. Some individuals grow to 14 inches.