I recently notice some green (kind of neon green color) alge on my rocks. It actually looks pretty nice, so I am not too worried about it. However, it seems to be spreading pretty fast. Anyone here know what this alge could be? I started my tank just over a month ago now and had a huge diatom bloom a couple of weeks ago. That is now gone. Was expecting green hair alge, but none so far. Only this other green stuff. Hope it is not something I should worry about???