Captive-raised Tridacna Clams are relatively easy to care for in aquarium conditions. All clams in this genus harbor symbiotic algae called zooxanthellae. These algae provide most of the food and nutrients the clams need to live. It is important to provide the necessary amount of light to keep their symbiotic algae flourishing. Some species, such as T. Maxima and T. Corcea, prefer to be on rock surfaces high in the tanks under higher par. In contrast, T. Squamosa and T. Derasa are “sand” clams and prefer to be on a sand bed under lower Par. Some aquarists supplement feed with commercial phytoplankton cultures. Tridacna clams do filter feed on this type of plankton, but do not depend on it.