The Red Sea Maxima Clam (BIOTA) is a valued cleanupcrew addition sold instore here in Columbus, Ohio. It acts as a scavenger and algae picker, keeps substrate clean, helping reduce maintenance and improve water quality. Stock 12 per 5 gal in a balanced reef or fishonly system for best results. Difficulty: Easy. Offer varied empty shells. Dripacclimate and maintain stable salinity for longterm health.