reefraf

Technical range is 7.5-11dkh, I personally keep mine in the 9-9.5dkh range.

I usually recommend 8 to 11 dKH, and in the past kept my tank at 8. For the past few months my reef has been running between 9 and 10 dKH, but a new gizmo I'm picking up today will help get it back to 8 dKH again.

Higher Alkalinity helps speed up SPS growth, but if it gets too high, a precipitation event may occur. Kinda like red-lining your engine: you get there really fast, but you MIGHT blow the engine.