Button polyp

[moseley75]

I have a button polyp that has been heretofore happy. The last several days all of the polyps will not open. There is nothing on it that I can see.

Tank parameters are:
Temp 78
Ammonia <.25
pH 7.8
Nitrite 0
Nitrate 10
KH 11
PO4 .25
SG 1.024

I use a Red Sea refractometer. I also have the lfs check my salinity and they use an electronic device to verify SG. pH has been 8.3 until I started using Red Sea Pro salt to mix the water. I do a 10% water change weekly. I was purchasing my water from lfs. They use instant ocean. I still get my RO/DI water from lfs as I only use 1.5 gal weekly.

 

[moseley75]

Forgot to mention. This is a 16 gal BioCube I had a small circulator in it but nothing was completely happy until I removed it and only use the circulation pump. It pumps 180gph.

 

[moseley75]

Think I found the culprit. I have some aptasia. I looked at the pic and found one I couldn't see. Aptasia x just chases them around am going to get a Nudibrach.