I thought i was set on a lighting set up until i went to a lfs who specialized in reef tanks. His shop was beutiful,and his tanks were perfect. He told me the way to go is power compacts if i was unable to afford metal halide (which i cant). I was going to use a 440 watt setup from hello lights.com bot he advised me to use a 220 watt power compact set up . He stated that even though the wattage was lower they are more efficient and generate less heat. My tank is a 90 gal with an amiracle wet dry a red sea protien skimmer 80lbs of live rock and a crushed coral substrate. Also do i have to swiych to a live sand substrate to keep a succesful reef tank. I know this is alot to ask on one post i really could use the help 8O