i have a baby maxima clam 1"-2" its on the sand bed 30" from a 250w 14k phoenix bulb on icecap ballast. The center has started to bleach on me. This clam is next to another same size maxima that is doing great. I also have a squamosa, derasa and crocea and all seem to be doing fine on the sand bed. The squamosa & derase put on almost 1/4 to 1/2" new shell a month. Should i move the bleaching clam up or will that only make it worse? IS it getting to much light or not enough? Thanks for any help/