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I have a few green spots popping up on my glass and rocks in my 30 gallon . What is it? And how do i get rid of it? Its hard to get it off. I have to use a razor blade to get it off glass.
If it is hard to get off - probably coralline algae. I leave mine on the back glass and rocks, but will use a razor blade to scrape it of of the front and sides.
Coralline on glass has a pattern to it - circular...