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I have a 60 g tank total volume system running for around 9 months now amd my no3 is pretty steady at 18 ppm . My po4 on the other hand is always zero so I have been micro dosing it with very little change . Every time I try to bump it higher the coral I have don’t seem to like it . I want to get in to sps and would like to lower my no3 to around 10 or a little lower and try and get my po4 stable any advice would be awsome