coral feeding nitrates dosing

Hi everybody, I’m in the hobby for 3 yaers and so far I have not fed my corals, manly sps and lps. I’m running a dsb tank with NO4 close to zero and high PO4 (0,2 ppm). I’m trying to reduce PO4 introducing macroalgae (they are working so far). I would like to start feeling the corals but I’m...