I am somewhat new to saltwater aquariums. Right now we have a 46-48 gallon bow tank. Last month I bought a 36" T5 HO lighting system that hold 2 T5 HO lights. Currently there is 1 6,500k and 1 Actinic 420 @ 39w per bulb on 10 hours. The max depth to the sand is 18 inches and the light is at...