im thinking of getting a clam can a crocea clam be placed on the sandbed? i was looking at yourreef and they had some nice ones if not out of crocea,maxima, derosa and squamosa which one would you recommend for a beginner clam owner ive never owned a clam in the past. i have 3 of the blackbox leds below tank is 72x18x28 they are about 6 inches off the water surface and i have them running about 40% intensity