Hears some information that I found on the web (((Dr foster and smith)))
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 these types of invertebrates. 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.(((Dr foster and smith)))
Saltwater Aquarium Guide -- Scallops & Oysters