this stuff is not slimy at all, so if Cyano is slimy, this is definitly not Cyano. It is dense and branching, kind of like those plastic potscrubbing pads, and taking over my tank

red and wooly right ....keep plucking it, or like I said my Sea hare ate it all

Red/burgundy and wooly, that is the perfect way to describe it. I will be in Vancouver next month, hopefully I can pick up some sea hares for my tank. Do sea hares do damage to anything else in a reef tank?

You guys are ID'ing two different kinds of algae in this thread. I see one that Wade is posting is Dictyota sp. and the algae Dabbler posted is called "Red Cotton ball algae" (Very scientific name, but I can remember the latin :razz: ) I did not know Sea-hares ate the Cotton ball algae previous to your post but "Mexican" Turbo snails also work.