Axolotl
Ambystoma mexicanum
A captivating coldwater amphibian (not a fish) that keeps its feathery gills for life.
| Difficulty | Intermediate |
| Min. Tank Size | 75 L |
| Temperature | 16.0–18.0 °C |
| pH Range | 7.0–7.5 |
| Max Size | 30.0 cm |
| Lifespan | 10-15 years |
| Diet | Carnivore |
| Temperament | Peaceful |
Overview
The Axolotl (Ambystoma mexicanum) is a captivating coldwater amphibian (not a fish) that keeps its feathery gills for life. It is a popular choice among Australian aquarists, reaching around 30 cm and living roughly 10-15 years when properly cared for.
This complete guide covers how to keep the Axolotl successfully - tank size and setup, water parameters, the best foods (including recommended brands), suitable tank mates, breeding, sexing and the health issues to watch for. It is rated Intermediate to care for.
Natural Habitat & Origin
The axolotl is a coldwater amphibian from the lakes of Mexico, not a fish. It keeps its larval gills for life, lives entirely underwater, and needs cool, clean, gently-filtered water - never a heater.
Matching the temperature, water chemistry and cover a species evolved with is the simplest route to keeping it healthy and seeing its natural behaviour and colour.
Tank Size & Aquarium Setup
Provide a minimum of 75 litres for the Axolotl. Give it a large footprint with sight-breaks and cover to reduce territorial aggression.
Keep the water cool (16-18°C) with gentle flow and absolutely no heater; use bare bottom or fine sand (never gravel, which causes fatal impaction) and provide shaded hides.
Always add fish only to a fully cycled, mature tank with stable biological filtration. Match filtration generously to the fish's size and waste output.
Water Parameters
Keep the Axolotl in stable water at 16-18 °C with a pH of 7.0-7.5. It adapts to a moderate range, so stability matters more than an exact figure.
Test regularly: ammonia and nitrite must read zero, and nitrate should be kept low with routine partial water changes. Always dechlorinate and temperature-match new water, because sudden swings cause far more illness than water that is stable but slightly imperfect.
Diet & Feeding
The Axolotl is a carnivore and needs a protein-rich, meaty diet.
In Australia, good options include earthworms as a staple, plus Hikari Massivore or sinking carnivore pellets and Dymax frozen bloodworm - never feed live feeder fish. Feed small amounts once or twice a day (only what is cleared in a minute or two), vary the diet for the best colour and health, and avoid overfeeding, which is the leading cause of poor water quality.
Temperament & Tank Mates
The Axolotl is peaceful and community-friendly. It mixes well with other calm species that share its temperature (16-18 °C) and pH (7.0-7.5) needs, are too large to be eaten and not large enough to eat it.
Breeding
The Axolotl is rarely or not bred in the home aquarium; most stock is commercially farmed or wild-collected, and home breeding is considered very difficult.
Even if you are not planning to breed it, recognising this behaviour helps you understand what you are seeing and respond well - for example by adding cover for fry or giving a guarding pair extra space.
How to Tell Males from Females
Mature males have a noticeably swollen cloaca (the bump behind the back legs) and a longer body, while females are rounder and fuller, especially when carrying eggs.
Common Health Problems
Axolotls suffer if kept too warm - heat causes stress, fungal infections and refusal to eat. Keep them cool, avoid gravel they could swallow (impaction), and treat fungus promptly with the right amphibian-safe methods. Quarantine new arrivals for 2-4 weeks and watch daily for early signs such as loss of appetite, unusual hiding, clamped fins or laboured breathing - caught early, most issues are very treatable.
Prevention beats cure: keep water pristine, avoid overstocking and overfeeding, quarantine new arrivals, and act at the first sign of trouble.
Is the Axolotl Right for You?
The Axolotl suits keepers with some experience and a stable, mature, appropriately sized tank, as long as you can provide at least 75 litres, water at 16-18 °C and pH 7.0-7.5, the right diet and suitable tank mates.
Meet those needs and the Axolotl will reward you for around 10-15 years. Use our free aquarium calculators to plan your setup, and explore our other fish, plant and disease guides to build a thriving aquarium.
How to Tell Males from Females
Sexual dimorphism is limited. Females tend to be fuller-bodied when in breeding condition and males slightly slimmer or more intensely coloured, but reliable sexing generally requires mature fish observed side by side, or spawning behaviour.
