I have just got through filling my 90gl tank with RO/DI, 60lbs aragonite sand and 20lbs live sand. I have 100lbs of Fiji live rock coming tomorrow and still need my light and skimmer. The light I was going to get is the Nova Extreme T5 ho 4x54. The guy at my lfs said that would be ok for some clams if I elevate them some? Now for the skimmer, I have no idea what to get as I never had one before? I need a hang on one and my tank to wall clearance is 6".