The Cleaner Clam, Mercenaria mercenaria, is a durable, beneficial, and functional addition to any tank. They are diligent water-cleansers and algae-eaters. Cleaner clams are essential members of any janitorial crew. They do not require light as they will spend much of their time burrowed under a sandy substrate.
Cleaner clams can also be great live food for other larger predatory organisms - so keep away from these types of tank mates if you do not want your clam to get eaten.