What is your NO3 at right now? The biggest thing you are going to need to drive down is the phosphate levels. Chaeto, GFO or FozDown would be a good start. Careful on reducing too quickly so you don't shock your corals. Your NOPO-X will drive down nitrates using little PO4 but will quickly hit zero and phosphates will need to be managed.
Keep us posted on your issues.
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300g Basement Reef - April 2018
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