I just got one today myself from The FishTank. High light (but I think not as high as other species). Small clams require supplimental feedings. Normal range of Ca, ALK, and pH, etc. Of course this is what I think but I am going to read more myself on Reef Central. Good Luck!
Hey Phillip nice to see you posting loved the pictures you sent me of your clam. I do believe Good lighting, Supplemental feeding for smaller clams, and Calcium 400-450 i think and your alk at good levels.
If the clam is less than 4 inches it will require phytoplankton as it can't produce enough energy with light alone. The larger the clam gets the less phyto will be required.