I am setting up a 8'x2'x20" acrylic tank with 2 double T5 HO Glo fixtures. 2 questions 1. How high above my tank should I hang the light fixtures?(currently have them suspended 5 inches from tank) 2. I have my fish and my FX5 on my 75 gallon and my FX5 is going to be running my new tank what do I do how can I make this transfer work without puting the fish right in tap water???? If this is the only filter I have how do I make this work???