Brown and bubble algea

[Jrreef]

I been having this problem for a year my tank its 2 years old I had my no3 and po4 at 0 now my no3 it's at 4 ppm but my po4 it's at 0 at least that's what my red sea says I see some growt in my sps frags but not the best coloration some of the are turning white any suggestions on what to do I been thinking on dosing po4 but not really sure since I have bubble alge

My tank it's a 90g plus sump minus rock and equipment I would said its 100g system for lighting I run 3 hydras 26 running the brs ab+ program and 2 orphek or2 blue plus and I run a refugium macro algea grow but slow

 

[Bret Brinkmann]

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