Glows is right. Funny thing, over the years I've already had my battle with the green hair, red slime, green slime, bubble, tufts of byopsis, and even a brown slimey goo that covered everything. I hung in there and beat them all but this stuff is kicking my butt! Just think, that picture is only the front of the tank, I have 8 more feet of identical coverage on the other side!