I had some of that as well but it just died off and went away. I run some other Macros in a fuge though. My PO4 is at 0.04 and my NO3 is always zero.
I don't run a phosphate remover and feed heavy every day. I think a large fuge is the way to go. That is why mine is almost the same size as my tank.
Anyway I think you might be able to get rid of it with your fuge as well.
Some of that smaller grape stuff is hard to come by and does not grow that quick. I would try to keep some of that. 
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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