Hello, I have zoas palys a mushroom and some other things that are all healthy and fine but my zoas stopped opening all the way. I added two more zoas and after a few days they also stopped opening all the way. Is there something that could only effect zoas?

Here is the water

Mg: 1335
Ca: 400
KH: 6.5
Ph: 8.2
Temp: 79-80
Salinity is fine

Here are some pictures, note the other corals in the background that look normal. This has been going on for a few months now.