Quick Answer
Malaysian trumpet snails eat soft algae, biofilm, detritus, leftover fish food, and decaying plant matter. They are bottom-dwelling scavengers, which means MTS eat the soft, rotting, and microscopic stuff that settles into your substrate. They usually leave healthy plants and live fish alone, though they will take fish eggs lying on the bottom.
What Malaysian Trumpet Snails Eat in an Aquarium
MTS (Melanoides tuberculata) are the quiet cleanup crew working your gravel while you sleep. They go after whatever soft, decaying, or leftover material they can find down there, so you rarely have to think about feeding them directly.
What makes up everyday MTS food?
- Soft algae and microalgae, the tiny algae you often cannot see clearly
- Biofilm, the thin slimy layer that grows on glass, rocks, and gravel
- Detritus, which is broken-down waste and debris
- Leftover fish food
- Decaying or melting plant material
- Tiny food particles trapped in your sand or gravel
The U.S. Geological Survey describes their diet as mostly microalgae and detritus, including dead plants and animals. That lines up with what you will see in your own tank: they graze the soft, microscopic life that collects in the sediment.
Still, it is important to keep your expectations honest. They are genuinely useful scavengers, but they are not magic cleaners, and they will never replace your water changes or gravel vacuuming.
| What MTS Eat | What MTS Won’t Touch |
|---|---|
| Soft algae and biofilm | Usually ignore healthy live plants |
| Detritus and organic debris | Live fish |
| Leftover fish food | Firm, established leaves |
| Decaying plant matter |
If you are still building your cleanup crew, read our guide on the best detritus snails for aquariums.
Do MTS Eat Algae? Soft Algae vs. Hair Algae
Algae is probably why you are considering them. MTS eat algae, and they are especially fond of soft algae, microalgae, biofilm, and diatoms (that dusty brown film that coats a new tank). The CABI database lists soft algae layers, fine detritus, and diatoms as part of what they graze.
Where people get tripped up is expecting them to clear a real outbreak. Some hobbyists say their larger snails will slurp down soft strands and even bits of Spirogyra, while others swear their MTS barely touch algae at all. Both can be true in different tanks.
The same goes for hair algae. Malaysian trumpet snails might nibble around the edges, but they are not your solution. If hair algae is winning, look at the real drivers first, such as too much light, excess nutrients, and overfeeding.
Do Malaysian Trumpet Snails Eat Live Plants?
This is the worry that keeps planted-tank keepers up at night. MTS usually eat plant matter only when the leaves are already dying, melting, or breaking down. They ignore your firm, growing leaves and go for the algae, leftovers, and melting tissue instead.
So, if a leaf looks chewed, look closer before you blame the snails. MTS clean up dead plant matter, not living stems. Nine times out of ten, that “eaten” leaf was already melting.
There is one honest catch from real tank owners, though. Big adults can act like little bulldozers, shoving freshly planted stems and delicate carpets like HC and microswords loose as they burrow. Once your plants root in properly, this settles down, and a thick, established carpet usually shrugs them off.
For more on planting around them, read our complete snail care guide.
What About Fish Poop?
You may have heard these snails sold as a fix for waste. MTS will graze on fish poop, but only after it breaks down into the detritus layer and starts collecting bacteria and biofilm. They are picking at it, not removing it.
As fish waste breaks down, it can still contribute ammonia to the tank. Your filter bacteria help process that waste through the nitrogen cycle, but snails do not replace filtration or water changes. Fish waste, uneaten food, and dead plants all add ammonia as they decompose.
So, lean on your filter, your water changes, and sensible feeding. The snails just tidy the leftovers.
Can MTS Eat Fish Eggs or Other Snails?
These two questions come up most in breeding and community tanks, and the answers pull in opposite directions, so it helps to take them one at a time.
Fish Eggs
Here you do need to pay attention, particularly if you keep fish that spawn near the bottom. The USGS states that this species will consume benthic fish eggs, meaning eggs laid on or in the substrate where MTS are already active. A study on endangered fountain darters found that every snail species tested consumed some of those bottom-laid eggs, with M. tuberculatu taking a smaller share than several others.
If your fish lay eggs higher on plants, décor, or protected surfaces, MTS are usually less of a concern. Eggs laid on or near the substrate are the bigger risk. Benthic fish eggs are soft, accessible, and right in the snails’ territory.
Other Snails
MTS do not hunt and eat other snails the way assassin snails do, so they will not turn on your healthy nerites or mystery snails. They will scavenge a snail that has already died, since dead animals are fair game for them. Their real impact is competition, because in big numbers, they can crowd others out for food.
What to Feed MTS When the Tank Runs Clean
In most established tanks, the honest answer to what to feed them is nothing extra. They get plenty from the algae, biofilm, and detritus already in there.
However, if your tank is brand-new, lightly stocked, or snail-only, a little supplementing keeps them healthy. Offer small amounts of:
- Sinking algae wafers
- Bottom-feeder pellets
- Blanched zucchini, spinach, or cucumber
- A pinch of calcium-rich food if their shells start looking thin
Now, the part most people learn the hard way: overfeeding is what triggers those famous population booms. The USGS has recorded densities as high as 10,000 snails per square meter, which tells you just how fast extra food becomes extra snails. Feed your fish less, and the colony usually has less fuel to keep expanding.
So, if your colony explodes, do not panic about the snails. The tank is simply handing them more food than you realized.
If your colony has already gotten out of hand, our guide on how to get rid of Malaysian trumpet snails walks you through your options, and if you want to understand why the numbers climbed so fast, our MTS reproduction and breeding guide explains the biology behind it.
Final Takeaway: Useful Scavengers, Not Tank Janitors
When you ask what Malaysian trumpet snails eat, the answer is soft algae, biofilm, detritus, leftover food, and decaying plant matter. They are handy substrate scavengers, not tank janitors. They stay safe around established plants; they can jostle new carpets while burrowing, and fish eggs are the one real breeding concern. And when their numbers spike, that is almost always a feeding clue, not a snail problem.
Frequently Asked Questions
Do Malaysian trumpet snails eat at night?
MTS are mostly nocturnal. During the day, they burrow into your substrate, then come out after lights-out to graze algae, biofilm, and detritus across the glass, gravel, and décor. If you rarely catch them feeding, peek at the tank at night, when they are most active and easiest to spot.
Can Malaysian trumpet snails starve in a very clean tank?
It is possible but uncommon. They are efficient scavengers and usually find food anywhere. But a brand-new, lightly stocked, or snail-only setup may not grow enough algae and detritus for a big colony. If their numbers drop or shells look thin, add small amounts of sinking foods or blanched vegetables.
Do Malaysian trumpet snails eat shrimp or shrimp food?
MTS will not hunt or harm your live shrimp, since they are scavengers rather than predators. They will happily clean up leftover shrimp pellets and sinking food your shrimp miss. That makes them safe shrimp tank companions, though both will compete for the same scraps at the bottom.
Will Malaysian trumpet snails eat a dead fish?
As scavengers, MTS feed on dead and decaying matter, including a dead fish or snail they can reach. This is normal cleanup, not hunting, because they cannot catch living animals. Even so, remove dead fish quickly, since a decaying body raises ammonia faster than any snail can process it.