The Nassarius Snail, Nassarius sp., is an excellent reef scavenger. Their trunk-like tubes extend from curved shells while searching the sand, tank wall, and rock for microfauna prey. Nassarius Snails are capable sand-sifters as they can sometimes burrow in search of food, often detritus. Nassarius Snails require minimal attention and will thrive without any care in established reef tanks with plentiful live rock and algae. Overall, these snails are incredibly beneficial and are often instrumental in keeping tanks clean and operational. The Emerald Crab, Mithrax sculptus, are one of the most popular marine crab species for the home aquarium. They thrive in tanks with plenty of live rock and a sandy substrate as the like to graze searching for algae. As voracious algae-eaters, they can be incredibly beneficial members of a cleanup crew. If there is not enough algae or seaweed, they can be supplementally fed with prepared meaty foods. They should, however, be fed regularly to keep them from becoming aggressive towards their tank mates. Emerald Crabs are particularly effective against bubble algae. There is a reason emerald crabs are so popular; they are very easy to care for, require almost no attention, and are effective in in controlling pesky algal blooms hence keeping the tank clean.