Green sinularia

[canadianbudz604]

My sinularia has been closed for 1 week. My Params are:

Sal 1.025
Nitrates 5
Ammonia 0
Calcium 420
Phos 0

What could be wrong with it? Params are good, nothing bugging it, I just changed the water today and all other corals are doing very well. I Tryed blowing it with a turkey baster (someone told me to do this as it may be shedding?!?! But no slime came off or anything. I dont know why it's closed nothing bugs it and it's all alone in its spot. Anyone?