I am not dosing anything at the moment, just water changes weekly. I dont have tons of coral and the ones i do have are pretty small or dont use much alk. Im guessing is the reason mine stays so high.maybe I missed it, but are you dosing any ALK supplement? I use Reef Crystals which has high ALK as well but my tank stays around 6.5-7.0 dkh because it is being used up. Is your tank not naturally lowering it for you?