Astrea tecta   The Astraea Snail will do well in an aquarium if provided with ample hiding places and sufficient room to roam. An aquarium with live rock is preferable so that it can graze on the algae. It will also graze on algae on the side of the tank. In addition, it eats cyanobacteria and diatoms.  If it falls, it is often unable to right itself, and will need the aquarist to place it upright, again. It is sensitive to high levels of copper-based medications and will not tolerate high nitrate levels.

Nassarius sp  Nassarius snails, which are commonly found in the coastal zones of most oceans, are one of the most ideal scavengers and detritus eaters for a reef aquarium. They have oval, spiral shells that resemble olive pits, and vary in size depending upon species. Nassarius snails, such as Nassarius vibex, are often around 1/2 inch in length, and are useful in smaller aquariums, refugiums, and aquariums with less sand surface area.

Cerithium sp.  The Cerith Snail is a small scavenger with an elongated spiral shell that is usually black with tiny white dots covering the entire shell. One of the most ideal scavengers, detritus eaters, and algae eaters, this snail is perfect for the reef aquarium, quickly devouring detritus, uneaten food, decaying organics, fish waste, and several types of nuisance algae. Cerith Snails will often bury themselves in the sand, which will help maintain adequate oxygen levels in the substrate.

Tridachia crispata ( Nudibranch )  It will do well in an aquarium, if provided with ample room to forage. It prefers an aquarium with live rock so that it can graze on algae. The Lettuce Sea Slug incorporates the chloroplasts (the portions of the cell responsible for photosynthesis) from the algae into its tissues, and thus relies on photosynthesis for part of its energy. It can be harmed by pump intakes and drains, so care should be taken to screen these off. It is sensitive to high levels of nitrate and will not tolerate copper-based medications.