Have you tested your silicate levels? Are you using RO/ DI water? You can still have algae with a 0 reading of phopahtes. I'm not an expert but something about nitrates and phopahtes being "locked" up and causing the issue.
Don't quote me on it. I thought I read that somewhere.
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"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley
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