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Well, the water changes aren't a factor. The green algae bloom as well as a brown algae bloom has all occured since I did a large water change after treating for cyano.
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Thats the problem with using chemicals to get rid of cyano. You don't find out what causes it and just end up with a different type of algae.
I would suspect a combination of, lights and nutrient build up , maybe in the rocks or sandbed