Yep happened to me when I was using ROWAPHOS. Its because the phosphate is stripped too quickly. ROWAPHOS works really quickly, some other GFO's are slower to remove phosphate which is easier on corals (but some not slow enough especially if your SPS have become used to higher levels of phosphate). Turn down the flow on your phosphate reactor or don't use as much (probably flow would be better/easier) and you should be okay. Its likely that your birdsnest is just the most sensitive of the lot and was affected first. I wouldn't worry about waterchanges, its unlikely that you're going to add phosphate back to the water to level it out.
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