I have a squamosa clam coming on tuesday. My lighting is 2x150W 14K HQI with 4x39W actinics. Currently I have 2 derasas on the sandbed doing great, 2 maximas 15" from the lights doing great. Can I place the squamosa on the sandbed(~24 in. from the lights), or do I have to place him higher on the rocks? for the sake of it I'll give parameters...Ca=460, Po4=0,no3=0,dkh=10, sg=1.025, UV and carbon are ran for water clarity.