A properly set up tank is the foundation of axolotl health. Axolotls have specific requirements that differ from tropical fish, so getting the setup right from the start is essential.
Tank Size Requirements
| Number of Axolotls | Minimum Tank Size |
|---|---|
| 1 | 75L / 20 gallons |
| 2 | 115L / 30 gallons |
| 3 | 150L / 40 gallons |
Choose a long tank over a tall one. Axolotls live on the bottom and rarely swim to the surface. A 20-gallon long tank provides more floor space than a standard 20-gallon.
Essential Equipment Checklist
- Tank (minimum 75L/20gal)
- Sponge filter or gentle HOB filter
- Thermometer (digital recommended)
- Water test kit (API Master Test Kit)
- Water conditioner (to remove chlorine)
- Hides (at least 1 per axolotl)
- Fine sand substrate or bare bottom
- Lid/cover
- Optional: chiller or clip-on fan for summer, live plants
Substrate Options
| Substrate | Safe? | Notes |
|---|---|---|
| Fine sand (grain < 1mm) | Yes | Natural look, axolotls can pass it safely |
| Bare bottom | Yes | Easiest to clean, best for hospitals and quarantine |
| Gravel | No | Causes impaction, potentially fatal |
| Large river rocks | Caution | Must be too large to fit in mouth |
| Soil/plant substrate | No | Toxic and impossible to clean |
Filtration
Axolotls produce a lot of waste, so biological filtration is essential. However, they hate strong water flow.
Best filter types:
- Sponge filter: the gold standard. Gentle flow, excellent biological filtration, cheap, and easy to maintain.
- Hang-on-back (HOB): works well if you baffle the output to reduce flow.
- Canister filter: excellent for larger tanks, but must be adjusted for gentle output.
Avoid: internal power filters with strong flow, undergravel filters.
Water Parameters
| Parameter | Ideal Range |
|---|---|
| Temperature | 16-20°C (60-68°F) |
| pH | 6.5-8.0 |
| Ammonia | 0 ppm |
| Nitrite | 0 ppm |
| Nitrate | < 40 ppm |
| GH (hardness) | 7-14 dGH |
The nitrogen cycle must be completed before adding your axolotl. This typically takes 4-6 weeks. Never add an axolotl to an uncycled tank.
Plants and Decorations
Live plants are beneficial because they help absorb nitrates and provide cover. Good choices include:
- Java fern: hardy, low light, axolotls cannot uproot it
- Anubias: tough leaves, attaches to rocks or wood
- Java moss: provides cover for babies
- Elodea/Anacharis: fast-growing, helps water quality
- Marimo moss balls: low maintenance, axolotls play with them
Avoid sharp decorations that could damage your axolotl’s delicate skin. No rough rocks, sharp plastic plants, or decorations with small holes where limbs can get stuck.
Lighting
Axolotls have no eyelids and are sensitive to bright light. Keep lighting dim or provide plenty of shaded areas. If you grow live plants, use a low-intensity LED on a timer (8-10 hours max). Many keepers use no artificial lighting at all.
Step-by-Step Tank Setup
- Rinse the tank and substrate thoroughly
- Place substrate (sand or bare bottom)
- Install filter and heater/chiller if needed
- Add decorations and hides
- Fill with dechlorinated water
- Plant live plants
- Start the nitrogen cycle (add ammonia source)
- Test water daily for 4-6 weeks until cycled
- Perform a large water change
- Add your axolotl
Articles in This Section
What Size Tank Does an Axolotl Need?
Minimum tank size for axolotls is 20 gallons (75L) for one. Learn the ideal dimensions, why bigger is better, and how to choose the right tank.
Read moreAxolotl Tank Mates: What Can Live With Axolotls?
Can axolotls live with fish? Learn which tank mates are safe, which to avoid, and why most axolotls are best kept with their own kind.
Read moreBest Plants for Axolotl Tanks
Top aquatic plants safe for axolotl tanks: java fern, anubias, java moss, and more. Low-light, axolotl-proof plants that improve water quality.
Read moreBest Filters for Axolotl Tanks
Which filter is best for axolotls? Sponge filters, HOB, and canister filters compared. Why gentle flow matters and what to avoid.
Read moreBest Substrate for Axolotls: Sand vs Bare Bottom
Sand, bare bottom, or large rocks? Compare axolotl substrate options. Why gravel is dangerous and which sand grain size is safe.
Read moreAxolotl Water Parameters: Temperature, pH & More
Ideal water parameters for axolotls: temperature, pH, ammonia, nitrite, nitrate, and hardness. Includes a reference chart and testing guide.
Read moreHow to Cycle an Axolotl Tank (Step-by-Step)
Cycle your axolotl tank before adding your pet. Step-by-step fishless cycling guide: ammonia dosing, testing, timeline, and when your tank is ready.
Read more