Pectinia swelling up

[Jtwinn26]

My pectinia will swell from time to time but now it’s getting crazy. Is this bad? What causes this? Also, zoas are elongated and closed up as you can see. Other corals are fine.

salinity 1.025
Ammonia 0
Nitrates 5
Phosphate 0
Cal 420
Alk 9

 

[Ron Reefman]

bump

 

[swampy]

I've seen my do that from time to time and never had an issue.