what's the maximum height from the water that you guys feel that you can get by with. I upgraded my frag tank to a 40 gallon breeder this weekend. due to its curent location in my small pantry, I can only mount the fixure 16" off the water. I have a 48" 6 bulb nova extreme pro. i'm running 4 blue+ 1 aquablue special, and one GE 65k. I was afraid that it was going to be too high off the water. but, so far my sps polyp extension seems greater than ever before. so, maybe the lights aren't too high?