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For short term dosing I use potassium nitrate (stump remover). If I ever got to the point that I would need to dose long term I would use food grade sodium nitrate.What would you recommend for dosing NO3? Potassium nitrate? On the phosphate note my tank has ran at 0 (tested via Hanna) and still had a similar infestation. Stuff comes back within 12 hours.
Your water could be at 0ppm PO4 because the cyano is consuming it quickly. You may want to add a little more phosphate remover but be prepared to feed your coral. If you have LPS you should notice them starting to suffer first.