What's running the tank and how long has it been set up.
[h=1]Lighting - 48" 216W T5 HO Aquarium Light Hood LCD Timer Coral Reef 4x54 Fluorescent
Cascade 700 Canister (Marineland died and had to have a quick fix)
3 1300 GPH power heads
Hang-on the back refugium with small T5 ligth hood
The tank has been set up about 4 years now.[/h]