I recently bought one of the odyssea 250w metal halide + 4 T5HO's and I have probably been running those for too long, so I've cut the mh
down to 0-1hr a day, and the t5ho's to around 6-8hrs, I have only 3 button polyps.
I have one power head for flow an odyssea 250gph, and a canister filter (Rena xp4) that has around 300gph. So I'm thinking about getting some more power heads, but I down have much real estate to work with. I have a 47g column tank.