I am currently cycling my live rock in a bare tank (no substrate) with powerheads and protein skimmer goig and have been waiting for the ammonia andNitrate to reach their levels. Issue is that the rock I am using has given off a white dust which is on parts of the bottom of my tank. I am having issues in getting it out as the gravel vacum that I have doesn't seem to get the suction I need and dust is too fine to be scooped out. Does anyone have any thoughts or suggestions or is it imperative that I get it out of the tank either way?