The Ultimate Axolotl Care Guide

The Ultimate Axolotl Care Guide: Everything You Need to Know About Keeping a Mexican Walking Fish

Axolotls (Ambystoma mexicanum) have taken the aquarium world by storm, and it’s easy to see why! With their sweet smiles, feathery external gills, and fascinating biological traits, these fully aquatic amphibians make unique and fascinating pets.

However, despite their cute appearance, axolotls require very specific water parameters and environment setups to thrive. If you're thinking of welcoming an axolotl into your home, here is your comprehensive, metric-focused guide to expert axolotl care.

1. Aquarium Setup & Minimum Tank Size

When it comes to housing an axolotl, bigger is always better. Axolotls produce a high amount of bioload (waste) and can grow up to 30 cm long.

• Minimum Tank Size: We strongly recommend a minimum of 100 litres for a single adult axolotl.
• Adding More Axolotls: If you plan to keep a pair, aim for at least 150 to 200 litres.
• Tank Footprint: Axolotls spend almost all their time walking on the bottom of the tank. Choose a tank with a wide footprint rather than a tall, narrow one to give them maximum floor space to roam.

Substrate Choices

• Bare Bottom: The safest option for beginners. It is easy to clean and poses zero impaction risk.
• Fine Aquarium Sand: If you prefer a natural look, use extremely fine sand (grain size under 1 mm). Only introduce sand once your axolotl is larger than 12–15 cm.
• Avoid Gravel & Small Pebbles: Never use gravel, small rocks, or coarse sand. Axolotls vacuum up their food and will swallow gravel, leading to fatal digestive blockages.

2. Water Parameters & Temperature

Axolotls are cold-water creatures native to high-altitude lakes in Mexico. Keeping their water cool and clean is the most critical part of their care.

Temperature Warning: Temperatures consistently above 20°C cause chronic stress, fungal infections, and premature death. In warmer climates, you will need an aquarium chiller to maintain a safe temperature year-round.

Invest in a good quality Testing Kit to stay on top of water paramaters: Shop AquaLabs Master Test Kit

3. Filtration & Lighting

• Low Flow is Key: Axolotls dislike strong currents, which cause stress and gill damage. Sponge filters or canister filters with adjustable spray bars angled toward the glass are ideal choices.

• Tank Cycling: You must complete a full nitrogen cycle in your tank using a liquid test kit before bringing your axolotl home. This usually takes 4 to 8 weeks.

• Lighting: Axolotls do not have eyelids and are extremely sensitive to bright light. Keep aquarium lighting dim, or provide plenty of hiding spots like smooth ceramic caves, hollow driftwood, or broad-leafed real/silk plants.

4. Diet & Feeding Schedule

Axolotls are carnivores that hunt primarily by scent and movement.

Best Staple Foods

• Live Earthworms or Blackworms: The absolute gold standard of axolotl nutrition (Lumbricus terrestris).
• Soft Axolotl / Carnivore Sinking Pellets: A great nutritious supplement high in protein.

Occasional Treats

• Frozen Bloodworms: Great for juveniles, but lack sufficient calcium/nutrition for adults.

Feeding Frequency

• Juveniles (under 15 cm): Feed daily.
• Adults (over 20 cm): Feed every 2 to 3 days (1 to 1.5 large worms per feeding).

5. Routine Maintenance Checklist

To keep your axolotl healthy and prevent disease, stick to a regular cleaning schedule:

• Weekly: Perform a 20% to 30% water change using a siphon vacuum to clear detritus from the tank floor.
• Water Treatment: Always treat tap water with a quality water conditioner (like Seachem Prime) to remove chlorine and chloramines. Avoid conditioners containing aloe vera or citrus oil, as these can coat and damage an axolotl's sensitive skin.

Quick Fun Facts About Axolotls

• Neotenic Wonder: Unlike most salamanders, axolotls never metamorphose into land animals - they stay in their aquatic larval form for their entire lives!
• Regeneration Superpowers: Axolotls can completely regenerate lost limbs, tail sections, organs, and even parts of their brain without scarring.
• Lifespan: With proper care in a 100L+ setup, an axolotl can live 10 to 15 years.

Final Thoughts

Keeping an axolotl is a incredibly rewarding experience, provided you take the time to set up their aquarium correctly. By investing in a generous 100L+ tank, keeping temperatures safely under 20°C, and feeding a healthy diet of worms, your axolotl will stay happy, smiling, and thriving for years to come.

Are you preparing a tank for an axolotl, or do you already have one? Feel free to share your setup questions!