Increasing flow (alot) would help.
It looks like cyano-ish. If so, you'll probably end up siphoning a lot until you get your nutrients under control. If it's not cyano, but rather a diatom film, then snails would be a good choice. Especially Stomatella varia, IMO. But if this is a young tank, I'd just hold off and see where things settle in a few weeks/months.
The bubbles are thought to be oxygen--the result of the photosynthetic activity of whatever organism you have there.
