Common name: Top Snails

Trochida, commonly known as top snails, is an order of marine gastropods that are highly valued in the reefkeeping hobby for their algae-grazing abilities and hardy nature. These snails are easily recognized by their conical, often beautifully patterned shells, which add both functionality and aesthetic appeal to marine aquariums. They are found in oceans worldwide, typically inhabiting rocky intertidal zones and coral reefs, where they play a crucial role in controlling algae growth.

In the aquarium setting, top snails are prized for their efficiency in cleaning live rock, glass, and other surfaces of nuisance algae, including diatoms and film algae. They are peaceful and reef-safe, making them excellent additions to community tanks. However, aquarists should ensure that their aquarium has stable water parameters and sufficient algae or biofilm to sustain these grazers. Supplemental feeding with algae wafers or nori can be provided if natural food sources are insufficient.

One of the most popular genera within Trochida is Trochus, which includes snails that are particularly favored for their ability to right themselves if flipped over—a trait not all snail species possess. This makes them less prone to predation or accidental death in aquariums. Additionally, their shells often serve as microhabitats for beneficial microorganisms, further contributing to the ecosystem of a reef tank.

It is important to note that while Trochida snails are generally hardy, they are sensitive to sudden changes in water chemistry, especially salinity and pH. Proper acclimation is crucial when introducing them to a new tank. They are also vulnerable to predation by certain fish species, such as wrasses and triggerfish, so compatibility should be carefully considered.