Hi Jon, pretty clam. Under those lights, he should be fine on the bottom, but maximas usually like to attach to a rock, as you probably know, so i would try to put a small rock under him, but you can still make it look like he's in the sand. And at that size, especially with maximas and croacas(sp?), phyto is really important so if your water quality will handle it, feeding him once a day wouldn't be a bad idea.