I have these green stick looking strand things that aren’t hard and they do move slightly in the flow of the tank and they are in little clusters on some frags and on the ends of some pieces of live rock. I’ve brushed them off with a toothbrush a time or 2 but they seem to reappear in other places or sometimes in the same places. I’ve tried googling it but can’t seem to find anything on it. I have no gha or bubble algae just these here and their. Any help would be greatly appreciated.