I sure do not know whwre y'all get yur so called live rock at, but in my life I have cured quite a few hundred pounds of the stuff and probablay have not gotten a teaspoon full of so called floating crap off it all. What live rock creates is crap you do not see without a test kit, and non of the stuff folks seem so compulsive to do away with or scrub away is most beneficial........Get the rock, and put it in the water and start cycling ./ curing it.....