i think scrubbing your rock is actually a good idea
it will lower your initial organics level surge, as you remove some of the nuisance algae that's on the rock now
just make sure you remove the rock to another container, first, and that you void any trapped air pockets when you place it back in the tank
i removed all of the rock from one of my tanks about 4x during the first year, and scrubbed it all down thoroughly
each time, thee was a noticeable 'jump' in the tanks overall performance/appearance
not too much fun for yer back, though :wink: