Always start your clams lower in the tank initially, most clams like the substrate if your using MH except coreca and some maxima. If the mantle is all the way open and the clam is not relocating than you should be fine. Squamosas' are my favorite clams and are easy to care for. Do not try to supplement feed as this will only case the clam distress. Also they will bind to the place they like the most as in using their basal filiments to attach. Sorry no spell check and left handed.