Malaysian trumpet snail

Quick facts

Adult size

3 cm

Lifespan

can live up to 2 years

Tank zone

bottom

Temperament

peaceful

Difficulty

beginner

Water parameters

Temperature

20–30°C

pH

7.0 to 8.5

Hardness

5 to 25 dGH

Tank requirements

Minimum volume

10 L

Minimum length

20 cm

Flow

low

Lighting

any

Substrate

fine

Feeding

Diet: omnivore, feeds primarily at the bottom.

Scavenger that eats decaying organic matter, uneaten fish food, algae, and biofilm. In a community tank, they eat whatever reaches the substrate. Supplemental feeding is unnecessary in most setups because they consume waste food. If keeping them intentionally and the tank is very clean, an occasional algae wafer or blanched vegetable provides extra nutrition. Overfeeding the tank accelerates MTS population growth because more food reaches the substrate.

Nocturnal feeder; drop food after lights out so it can eat without competition.

Compatibility

• The most polarizing invertebrate in the hobby. Half of fishkeepers consider MTS essential tank inhabitants; the other half consider them a pest. Both perspectives have merit.
• Beneficial: they burrow through substrate, aerating it and preventing anaerobic gas pockets. In sand substrates this is genuinely useful. They also eat uneaten food, decaying plant matter, and algae.
• Problematic: they reproduce rapidly and population explosions can reach hundreds or thousands in a single tank. The population tracks food availability, so overfeeding makes the problem worse.
• Assassin snails (Clea helena) are the biological control method. They eat MTS and keep the population in check. Chemical removal is difficult because MTS burrow into the substrate to escape treatment.

Habitat

Native to freshwater habitats across Southeast Asia, from Malaysia and Thailand through Indonesia. Found in rivers, streams, ponds, and rice paddies over sandy and muddy substrates. The species (Melanoides tuberculata) has become one of the most widely distributed freshwater snails in the world through human introduction. Established populations exist on every continent except Antarctica. In the aquarium hobby, they arrive as hitchhikers on plants, substrate, and driftwood. The shell is elongated and conical (unlike the disc shape of ramshorn snails or the rounded shape of mystery snails), brown to light tan with darker spiral markings. Adult size is 2–3 cm shell length. They're nocturnal burrowers: during the day, most of the population is buried in the substrate, emerging at night to graze surfaces. A sudden appearance of MTS on the glass and decor during daytime often indicates a water quality problem (low oxygen, high ammonia) that is driving them out of the substrate.

Breeding

Parthenogenetic: females reproduce without males. A single snail introduced to a tank can found an entire population. Females produce live young (no egg stage visible to the keeper). Offspring are born as tiny fully formed snails that burrow into the substrate immediately. Reproduction is continuous and tracks food availability. In overfed tanks, population growth is exponential and can reach pest levels within months. In clean, lightly fed tanks, populations self-regulate at moderate levels. There is no practical way to prevent breeding short of removing all individuals, which is nearly impossible because they hide in the substrate.

Common problems

Population explosions are the main issue. A tank that starts with a few hitchhiking MTS can have hundreds within a year if overfed. The population visually overwhelms the tank and competes with other bottom-dwellers for food. Control methods: reduce feeding (fewer MTS survive), introduce assassin snails (biological control), or manually trap them overnight with blanched vegetables. Chemical treatments (copper) kill MTS but also kill all other invertebrates and can harm scaleless fish. MTS carry parasites in the wild (they're an intermediate host for several trematode species that affect other organisms), but tank-bred populations that have been captive for generations pose negligible parasite risk. The daytime emergence pattern is useful as a water quality indicator: if MTS are all over the glass during the day, check water parameters.

Bioload

Bioload coefficient: 0.1 (small snail; floor-lifted to validator minimum).

Bioload coefficients are calibrated against the neon tetra as the anchor (1.0). See the methodology page for the formula and how each value was derived.

Further reading

• How to cycle a fish tank
• Stocking ideas by tank size