You might be OK with a derasa or a squamosa, if you can get them to stay close to the lights. The problem is that they like to move, and those 2 species are often happiest on the sand bed. In your case, the sand bed is too far away from the lights.
If you're interested, I strongly urge you to read Daniel Knop's "Giant Clams" book before buying any clams.
Best of luck
Jeff