As I try to finalize the cycling of my tank, I've noticed that I have patches of three different colors of algae growing on my substrate. Most of it is this brownish colored stuff. There's also patch of a very bright green, and then there are some patches of something that's almost black in color. What are they, are they harmful, and what can I do to get rid of them?
There is some of the brown and green on the Java ferns too.
There is some of the brown and green on the Java ferns too.