Minimum size: While a 10-gallon tank can physically hold a juvenile, aim for at least a 20-gallon “long” for one adult. The long footprint maximizes floor space, which axolotls use far more than vertical space. Larger volumes also dilute waste and make parameters more stable. (Bigger is always easier to keep stable.) Water Critters
Footprint first: Prioritize length and floor area over height.
Cooling plan: Keep the tank somewhere cool. If your room gets warm, plan on fans, a mesh lid for evaporative cooling, frozen water bottles (short-term), or a chiller in hot months. Avoid heaters. Axolotls are stressed by warm water and should not be kept above the low 20s °C. Royal Veterinary College
Safest choices: Sand (fine grain) or bare bottom.
Avoid gravel/pebbles: Axolotls “vacuum” food and commonly ingest gravel, which can cause impaction or death. If you insist on decor stones, they must be much larger than the head. Royal Veterinary College+1
Why sand works: The small particle size is less risky if swallowed and lets axolotls root around naturally (digging/foraging).
Hides: Provide multiple caves/tubes (e.g., PVC elbows, ceramic hides, smooth pots) so the animal can fully retreat from light.
Plants: Choose hardy, cool-tolerant, low-light species like Java moss, Anubias, Java fern, Hornwort/Elodea; they also help diffuse flow. Aquarium Source
Edges: Keep all decor smooth—no sharp edges that could tear external gills.
Low & indirect. Axolotls don’t need special lighting, and bright lights can stress them. If you keep live plants, use dimmable LEDs and provide shaded zones/hides. Royal Veterinary College
Robust biofiltration, gentle flow. Use a properly cycled filter with ample biological media. Add a spray bar, baffle, or dense plants to break up current; fast, turbulent flow is stressful to axolotls. Royal Veterinary College
Oxygenation: Keep good surface agitation (not a “jet stream” across the tank).
Temperature: 16–18 °C (60–64 °F) is ideal; keep in the mid-teens to very low 20s, and do not exceed ~24 °C. Chronic warmth causes stress and illness. Royal Veterinary College
pH: Axolotls tolerate ~6.5–8.0; aim near neutral to slightly alkaline and keep it stable (sudden shifts are worse than sitting a bit off “perfect”). Many veterinary guides suggest ~7.4–7.6 as a sweet spot. Match the pH your axolotl was raised in when possible. Royal Veterinary College
Hardness & buffering: Prefer moderately hard water with some carbonate buffering. A common keeper target is ~7–14 °dGH and ~3–8 °dKH (helps buffer pH). Water Critters
Dechlorination: Chlorine/chloramine must be 0 ppm—always treat tap water with a reliable water conditioner before it touches the tank. Chlorine/chloramine are harmful to amphibian skin and gills. Royal Veterinary College
Nitrogen cycle:
Ammonia (NH₃/NH₄⁺): 0 ppm
Nitrite (NO₂⁻): 0 ppm
Nitrate (NO₃⁻): keep low with water changes; many husbandry guides keep it <20–40 ppm (lower is better). Veterinary guidance emphasizes routine changes to prevent nitrate buildup. Royal Veterinary College
Tip: Before adding your axolotl, cycle the aquarium (establish nitrifying bacteria) so ammonia and nitrite read zero. Add the animal only after the cycle is complete. Royal Veterinary College
Tools: gravel/sand siphon, liquid test kit, water conditioner, algae scraper, towels/buckets.
Test water (ammonia, nitrite, nitrate, pH; temp check).
Change 20–30% of the water (many veterinary sheets say 10–20% weekly; a 20–30% target works well in smaller tanks or heavier bioloads). Always dechlorinate replacement water and temperature-match it. Royal Veterinary College
Vacuum debris from the sand surface (or lift waste with a turkey baster for spot-cleaning).
Rinse mechanical media (sponges/floss) in old tank water, never under the tap, to preserve beneficial bacteria.
Wipe algae from glass and hardscape as needed.
Keep a simple log (date, parameters, %, notes). It makes trends obvious and troubleshooting easy.
If you see forward-curled gills, persistent floating, or frantic swimming, reduce flow and check temperature. These often signal stress from current or heat. Royal Veterinary College
Appetite changes and lethargy can also point to water quality issues—test immediately.
Tank size? A 20-gallon long is the practical baseline for one adult; larger is easier to keep stable. Water Critters
Substrate? Sand or bare bottom; avoid gravel due to impaction risk. Royal Veterinary College
Plants & hides? Yes—Anubias, Java fern/moss, Hornwort + caves/tubes. Aquarium Source
Lighting? Keep it dim/diffused; bright light can stress axolotls. Royal Veterinary College
Filter? Cycled with gentle flow; break the current with a spray bar or plants. Royal Veterinary College
Parameters? Temp ~16–18 °C ideal (stay cool), pH 6.5–8.0 (stable), ammonia/nitrite 0, nitrate low, and 0 ppm chlorine/chloramine (use conditioner). Moderately hard water with some KH buffering is preferred. Royal Veterinary College+1
Maintenance? Weekly 20–30% water change, vacuum waste, dechlorinate, and test. (Vet guidance notes weekly changes and gentle flow.) Royal Veterinary College
Royal Veterinary College (RVC) Axolotl Husbandry & Medical Care – temp 16–18 °C ideal, avoid fast flow, danger of gravel ingestion, chlorine is harmful, weekly water changes. Royal Veterinary College
Ambystoma Genetic Stock Center (AGSC) – background biology & husbandry context from the world’s primary research colony.
Water Critters (Canadian axolotl specialist; vet-derived care sheet) – practical keeper targets for GH/KH and parameter ranges used widely by hobbyists. Water Critters
AquariumSource (hobby reference) – examples of suitable plants, substrate rationale, and gentle-flow emphasis. Aquarium Source
Tank Size at least: 72 Liters
Tank Type: Planted with sand(Optional, More info around substrate coming soon) substrate and caves
Diet: Carnivore
Tank mates: None
Temperature: 15-23°C
pH: 6.5-8.0
Chlorine and Chloramines: 0 ppm
Ammonia: 0 ppm
Nitrite: 0 ppm
Nitrate: 0-10 ppm
General Hardness: 7-14 GH
Carbonated Hardness: 3-8 KH
Common Names: Axolotl, Mexican walking fish, Mexican Salamander
Scientific Name: Ambystoma mexicanum
Species: A. mexicanum
Family: Ambystomatidae
Genus: Ambystoma
Size: 15-30 cm long (Some Species known to rach 45cm)
Lifespan: 10-15 years
