Blowing's better. It frees up detritus to get caught by filters/skimmers/settle out int he sump, and a lot of smaller-polyped corals and some other corals seem to like sucking up the clumps of bacteria and gunk.Just wondering if scrubing (lightly) and /or blowing off debris(using small pump) from live rock is a good idea....will it do harm or good? :tub: