how high off of he water should t5s be? i just built my canopy with t5 retro installed in it and was wondering what the average is. i keep lps some shrooms zoas and will maybe one day get some low light sps like monti caps or something at the very top, about 5-7 inches below the water. i have 5 bulbson a standard aga 90 gal. they sit about 5-6 inches above right now. is that good? thanks in advance.