I have a Red Sea reefer 450 which is 59"x20"x22" tall. I'm going to switch from my radions to one of these I think. My tank is now dominant sps and I'm just not getting the growth i think the T5 guys are. So first which fixture does everyone prefer? And for my size tank 48" should be good right? There isn't anything but open water on the end 5-6" of each side of the tank.