Welcome to RAG!
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When you have this problem in an older tank, check your water change schedule. This can be part of the problem.
Also, check your feeding schedule. Just because your reading for nitrate and phosphate are at or near 0, doesn't mean that there is not a nitrate and/or phosphate problem. You have one, or else you wouldn't have the algae problem.
Good luck. It takes time and effort, but it can be dealt with.
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