Scallops share a two-part shell with a hinge and foot, though they have no true head.  All are filter feeders, requiring food designed for filter feeding inverts. This makes them somewhat more demanding in the home aquarium than their cousins the Tridacna clams. They require a sandy substrate or a large rock formation to find comfortable spots to rest and feed. Specialized foods and great water quality are required to successfully maintain these organisms in the home aquarium.