Right now I have my 4 X 110 Vho's sitting on top of tank: 2 atinics and 2 white. But I also have 2 X 250 IceCap MHs to go in my canopy. I want a mixed reef with alot of LPS and SPS that is the reason for the metal halides. I want to run my Vho's for about 10 hours a day and just run my MHs for about 4 to 6 to give growth a boast. It might be overkill put I have seen a lot of 90s on here with close to the same setup.