Gresham Pet Supply Pet Care Guide
Axolotl
Ambystoma mexicanum
Why We Love Them: Axolotls exhibit "neoteny," meaning they never undergo metamorphosis into a terrestrial salamander. They keep their gills and remain fully aquatic their entire lives. With their feathery external gills and permanent smiles, they are one of the most unique and beloved aquatic pets in the world.
Lifespan
10 to 15 years
Adult Size
9 to 11 inches
Enclosure
Long, low tank
Warm / Basking
Cold water, no heater (ask our staff)
Cool Side
pH 6.8–7.8 • Dechlorinated
Humidity / Water
Fully Aquatic
Species Profile & Temperament
| Trait | Overview |
|---|---|
| Origin | Lake Xochimilco, Mexico (Critically endangered in the wild) |
| Diet Type | Carnivore (Earthworms, specialized sinking pellets) |
| Activity | Diurnal/Crepuscular (Bottom-dwellers that "walk" along the tank floor) |
| Temperament | Peaceful, slow-moving, and highly engaging. They will often beg for food at the glass. |
| Handleability | None. They are fully aquatic and possess an incredibly delicate slime coat. Never use a net to move them (it damages their gills); use a plastic tub to scoop them if necessary. |
| Difficulty | 3/5 — Intermediate (Strict temperature and water quality requirements) |
| Hardiness | 3/5 — Moderate (Highly sensitive to warm water and ammonia) |
Temperature Warning (CRITICAL)
THEY MUST BE COLD: Axolotls are cold-water animals from Lake Xochimilco in Mexico. Warm water stresses them and can lead to fungus and death. Never use an aquarium heater. Ask our staff for the range we keep ours at. If your room gets warm in the hottest week of summer, you will likely need an aquarium water chiller (which is a significant purchase).
Substrate & Impaction (CRITICAL)
NO GRAVEL EVER: Axolotls are "suction feeders." When they eat, they rapidly inhale everything in front of their mouth. If they are kept on standard aquarium gravel or small pebbles, they will inhale the rocks. This causes fatal intestinal impaction.
The only safe substrates are: A bare-bottom glass tank, large slate tiles, or very fine, powdery aquarium sand (only for full-grown adults). Young axolotls do best on a bare bottom.
Housing & Enclosure
Aquarium Setup
- Type: Fully Aquatic.
- Size: A long, low tank is best. They need floor space, not height. Ask our staff to help you choose a size.
- The Nitrogen Cycle: You CANNOT put an axolotl into a brand-new tank. The tank must be fully "cycled" for 4 to 6 weeks using liquid ammonia before the animal arrives to establish beneficial bacteria. (Ammonia and Nitrites must test at 0 ppm).
Filtration & Water Flow
- Axolotls have a massive bioload (they produce a lot of waste). You need heavy filtration (like a canister filter or a large sponge filter).
- Low Flow: They hate strong water currents. If using a canister or hang-on-back filter, you must baffle the output using a spray bar or a sponge so it doesn't blow the axolotl around the tank.
Diet & Feeding
- Staple Diet: Earthworms (nightcrawlers or red wigglers) or a sinking pellet made for axolotls. Food must be small enough to swallow whole.
- Treats: Frozen bloodworms now and then (messy, best for young axolotls). Thaw frozen food in the fridge.
- Schedule:
- Follow the feeding directions on the food's label. Young axolotls eat more often than adults.
- Take out uneaten food so it doesn't foul the water.
- Use long feeding tongs to drop the food directly in front of their face.
What We Use & Recommend
| Category | Product | Notes |
|---|---|---|
| Housing | Aqueon Breeder Tank | Long, low footprint |
| Filtration | Fluval 307 Canister Filter | Essential for handling their heavy bioload |
| Substrate | CaribSea Super Naturals Aquarium Sand | Safe, ultra-fine sand for adults |
| Water | Seachem Prime & API Freshwater Master Kit | Essential for water conditioning and testing |
Last updated: 2026-08-04
How We Keep Them at Critter Cabana & Gresham Pet Supply
- Oregon Tap Water Warning (Ultra-Soft Bull Run & Willamette Valley Water): Municipal tap water across the Portland Metro and Willamette Valley comes out of the tap extremely soft (
0–1 dGHand0–1 dKH). Because Axolotl need some dissolved minerals and carbonate buffer for stable water, straight Oregon tap water will cause pH crashes and mineral deficiency. In our fish rooms at Critter Cabana (Newberg) and Gresham Pet Supply, we buffer and remineralize soft tap water using Seachem Equilibrium, Seachem Alkaline/Acid Buffer, or a mesh bag of crushed coral in the filter. - Free In-Store Water Testing & Cycling Help: Bring a small cup or vial of your tank water into Critter Cabana (Newberg) or Gresham Pet Supply and our aquatic crew will test your ammonia, nitrite, nitrate, pH, and KH/GH for free before you add fish.
Common Questions (FAQ)
Is Oregon tap water safe for Axolotl?
Willamette Valley and Portland Metro tap water is very clean once treated with a dechlorinator like Seachem Prime, but it comes out of the tap ultra-soft (0–1 dGH and 0–1 dKH). Because axolotls need stable, clean water, we recommend bringing a water sample into Critter Cabana (Newberg) or Gresham Pet Supply for a free KH/GH and pH check so your tank doesn't experience a pH crash.
What size tank does a Axolotl actually need?
Plan on a long, low tank with a fully cycled biological filter and cold, stable water (no heater, and a chiller if your room runs warm). Larger water volume keeps water chemistry much more forgiving, especially in Oregon's low-KH tap water.
What do you feed Axolotl at Critter Cabana and Gresham Pet Supply?
We feed earthworms or a sinking pellet made for axolotls, sized to swallow whole, with fridge-thawed bloodworms as an occasional treat. We follow the food label and take out leftovers.
Where can I buy healthy Axolotl in the Portland or Willamette Valley area?
Ask us what we have in store today at Critter Cabana in Newberg (503-537-2887) and Gresham Pet Supply (503-665-7606).
Shop supplies for this animal
Everything for your Axolotl setup, ready for pickup in store or shipped to you.
