Can someone tell me if this is cyanobacteria? I've looked at as many pictures I could find and it doesn't look like the pics I've seen of cyano. It doesn't seem to look as dense as what I have. I can peel it off the rock, and it leaves like almost a green film left on the rock. You can kind of see the green film in the picture. It's not on the sand at all, just on the top of some of the rocks in my tank. Thanks!
