Tire Track Eel
Mastacembelus armatus
The Tire Track Eel (Mastacembelus armatus) is a peaceful fish that's best left to experienced keepers. Give it a tank of at least 300 litres (79 US gallons), water held at 75-82°F, and a pH of 6.5-8.
Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
South / Southeast Asia
- East & Southeast Asia
Regional colours match the stocking calculator's origin map.
Tire Track Eel Tank Setup
Treat 300 litres (79 US gallons) as a starting point - big predators need length, strong filtration, and a secure lid. Hold the water at 75-82°F and pH 6.5-8, and assume anything small enough to swallow will eventually be eaten. They grow to around 50 cm, so plan the tank size and filtration for a full-grown adult rather than the small juvenile you see in the shop.
What Do Tire Track Eels Eat?
They're meat-eaters, so feed good-quality frozen or gel foods rather than relying on generic flake. Go easy on portions - leftover protein fouls the water faster than plant foods do.
Tire Track Eel Tank Mates
Large spiny eel (oddball). Will eat small fish and inverts. Needs a long tank with fine sand for burrowing, tight-fitting lid (escape artist), and excellent filtration. Not a community nano fish. The Tire Track Eel is peaceful, which is the first thing to weigh up when you choose tank mates. It's predatory, so anything small enough to fit in its mouth will be treated as food rather than a companion. Before you buy, run your full stocking list through our stocking calculator. It weighs temperament, adult size, and water needs together, which a single species page can't do on its own.
Are Tire Track Eels Good for Beginners?
Not a sensible first purchase. Get the tank cycled, keep easier fish stable for a year, then revisit if you still want the extra work this species demands.
Tire Track Eel - frequently asked questions
What size tank do Tire Track Eels need?
Tire Track Eels need a tank of at least 300 litres (79 US gallons). A bigger tank is always easier to keep stable, and gives them more room to settle in and behave naturally.
What water parameters do Tire Track Eels need?
Keep them at 75-82°F with a pH of 6.5-8, steady rather than chased to an exact figure. In a cycled tank, ammonia and nitrite should both read 0 ppm, with nitrate kept low through regular water changes.
What do Tire Track Eels eat?
Tire Track Eels are meat-eaters. Feed good-quality frozen or gel foods rather than relying on generic flake, and don't overfeed. Feed small amounts once or twice a day, and remove anything they don't eat.
Are Tire Track Eels good for beginners?
Tire Track Eels are not a beginner species. They need precise conditions and consistent maintenance, so build experience with hardier fish before keeping them.
Common mistakes with Tire Track Eels
- Underestimating tank size - the minimum footprint is 300 litres (79 US gallons); impulse buying into a smaller tank leads to stress and shortened lifespan.
Building a community? Run the full list through the stocking calculator before you add anything else.
Great tank mates
Chosen from temperament, overlapping temperature/pH bands, plausible minimum tank footprints, and size versus yours in App-aquatic data. Hobby nuance always wins - verify stocking and temperament before purchasing.
Check Tire Track Eel against any other fish → Compares water parameters, predation risk, fin nipping and tank size, and draws both at life size.
Fish to avoid mixing with Tire Track Eels
These well-known species are commonly sold alongside this fish but are not recommended tank mates - verify before purchasing.
- OscarPredator - Oscar will eat or injure smaller tank mates
- Zebra DanioFin nipper - will shred the fins of peaceful fish
- Clown LoachFin nipper - will shred the fins of peaceful fish
