Hi there, I've tried to search the net for some answers but am not having much luck. I have a beautiful porous rock that I would love to add to my tank (which is cycling at the moment, I'm new to marine life!). Unfortunately this rock has some moss on it. I'm not sure what kind of moss it is, but some is green, some is orange. I'm trying to get it off without using chemicals but am not having much success. Anyone have any advice? I don't want to put this rock in if there's any chance of it screwing up my fragile new biofilter....