Intro: Tridacnid clams are known as durable tank inhabitants that don’t require much effort in terms of their care. This is generally true after the clams are well adapted to the aquarium environment. But, because all environmental factors in an aquarium can differ remarkably from the clam’s former habitat, these beautiful mollusks can have considerable difficulty during this period of adjustment to things such as illumination, pH, temperature, salinity and water current — to name just a few. And some of these changes will probably be drastic.