Some corals swelling why?

[Tayreef93]

I’ve noticed that my pectinia tissue swells up, ive seen this happen with lps, but ive also noticed my meteor Cyphastrea do the same thing. The blue tissue is swelling up and covering some of the polyps . I attached a picture of the Cyphastrea. Just wondering if anyone has seen this before?

 

[shakacuz]

too blue for me to tell if it’s normal or something else. but yes, my pectinia does also swell up!

 

[Dave1993]

might be allergic to salt

 

[Tayreef93]

too blue for me to tell if it’s normal or something else. but yes, my pectinia does also swell up!

I attached a better pic