we have bubble algea, it isn't hurting anything in our tank and has been there a long time. I've heard people say that it took over their tanks, but ours stays in a small clump and adds some visual interest. When the clump gets bigger we break some off and throw it away. a lot of people, even pet stores around here, have had a bad time with the cyano
. It seems to be real bad in tanks where people have brought stuff home out of the ocean and dumped it in their tanks, or people who have bought things from pet stores who go get stuff out of the gulf or that have the cyano
problem... then they bring it home to their tanks. we have never had it bad thank goodness, way back when we first started our reef, we had gotten a piece of rock from the beach and put it in there, we had one spot on the sand about the size of a wash cloth. We weren't sure what it was so we left it. it got thick and to where you could pick it up, it kept building up air bubbles under it, one day a fish bumped it or something, it lifted off the sand floated to the top, we fished it out, it was slimy and like snot sort of, we threw it away and have never seen hide nor hair of it since.