I have this dark brown algae growing on some of my rocks. It’s grow on my glass cleaner too. I know people will say it’s Cyano but it does not scrub off. It acts like coralline but I don’t think it come in this color. Any ideas?
Here are my little brown freckles. This pic was taken a week ago, it's about double the spread now. I just did a water change so the water was too cloudy to get a clear picture of the current state.