Patience, it will take several weeks at least for the rock to cure. You should provide strong flow in the tank using powerheads and set your skimmer to aggressivly skim the tank, also I do 40-50% water changes twice weekly when using uncured rock in anewly set up tank. The good thing is it will happen at the same time the tank is cycling, so once your water params are stable you will have a great system to start with.