PPE issue

[Azurel]

It usually isn't an issue as they return to normal.....Not sure myself why they do it.

 

[saltwaterfishes]

I lost a 9-polyp frag not too long ago, they closed up and slowly shrunk away. So I got a 2 polyp frag about 2 months ago and now have 5 polyps. Does anyone know where they are most happy in the tank? It's been sitting on the frag rack, but I need to take out rack and afraid I'm going to loose it again if I move it.