Hello all...This is my first question/post since I have joined...I have a 55 gallon tank with about 14 small fish and many corals. I have a 48" 4 tube T5 HO light,giving out 216 watts. There are 2 10K and 2 atinic tubes. I would like to know what are the best settings for the lights? I mean how many hours should I keep the atinics on and the daylights? Right now I am keeping the attinics on for about 12 hours and the daylights on about 9 hours. I would like to hear what you think about this? Thank You....Mike