Little Aquatic Monster

The axolotl, also known as the "aquatic monster" or Ambystoma mexicanum, is a fascinating creature that is attracting growing interest in the aquarium hobby. Native to Lakes Xochimilco and Chalco in Mexico, this neotenic amphibian (meaning it retains juvenile or larval characteristics throughout its life) is famous for its unique ability to regenerate its limbs, heart, eyes, gills, and even parts of its brain. Unlike most other amphibians, the axolotl remains in its larval state throughout its entire life, retaining its feathery external gills that give it such a distinctive appearance.

Keeping axolotls in an aquarium presents unique challenges, but also exceptional rewards for hobbyists. These creatures require specific conditions, including cool, well-oxygenated water, a safe substrate to prevent accidental ingestion, and a proper diet consisting mainly of earthworms, small fish, and specially formulated pellets. Axolotls are also sensitive to changes in temperature and water quality, requiring particular attention from the aquarist.

Beyond their exotic appearance and impressive regenerative abilities, axolotls display interesting behaviors that can provide hours of fascinating observation. Their popularity in the aquarium hobby reflects not only their visual appeal, but also the growing importance of their conservation, as they are currently classified as critically endangered in their natural habitat.

What an Axolotl Needs (Quick List):

1. A 20-, 30-, or 40-gallon aquarium with an emphasis on length (or a "Breeder" style aquarium), providing more floor space, such as the ones we currently have in store. As a general guideline, ideally allow approximately 150 to 200 square inches of floor space per axolotl.
2. They generally do not need tankmates, and ideally should not be kept with other fish. They can enjoy living as a pair, although this is not mandatory. However, avoid keeping a female completely alone due to the possibility of egg retention, which can potentially lead to death.
3. Water should have a pH between 6.5 and 8.0 and a temperature of approximately 18–20°C maximum. Ammonia should be 0, nitrites 0, and nitrates ideally no higher than approximately 20–30 ppm. Perform weekly water changes of approximately 25–30%. Use Seachem Prime as a dechlorinator/water conditioner. Avoid products containing aloe or iodine, which could potentially trigger metamorphosis.
4. Filtration should not create excessive movement or strong currents in the water. A canister filter or HOB filter rated for approximately 1.5–2 times the aquarium volume is generally sufficient, although additional filtration can be beneficial. Sponge filtration can also be used, but may sometimes be insufficient due to the significant amount of waste (bioload) produced by an axolotl.
5. Use fine or very fine sand, never coarse gravel, and make sure all decorative elements are larger than the axolotl's head to prevent accidental ingestion.
6. Lighting is not necessarily required. If plants are added, consider species such as Anubias, Elodea, Java Fern, etc.
7. The recommended diet consists primarily of earthworms (small, properly purged, and pesticide-free), axolotl pellets (preferably JBL), as well as bloodworms and similar foods as occasional treats.
8. Decorative elements and hiding places can be included in their environment, but make sure they do not have sharp edges because axolotls have delicate skin.

This information has been validated by experienced breeders. Have questions? Ask us!

The axolotl is a fragile but fascinating 100% aquatic amphibian!