I always wanted a clam. At MACNA 2002, I saw about a hundred for sale, and asked many reefers what they thought would live under 3x55w Power Compact lighting. They agreed that my best choice was a Derasa. However, they were huge! This small blue Tridacna maxima called out to me and I put it at the very top of the tank for a few months. It jumped to the substrate, and has been happy as a clam ever since - for nearly five years. I feed phytoplankton to my tank every other day.