Mushrooms dying or melting???

[JennyH3]

My corals were doing amazing. Last month I had a phosphate issue. My parameters are now just fine.
They seem to be melting - losing the middle little bubble things (dont know what they are called)
The light isn't very bright - it was I just changed it lower just in case that was the issue. They used to be so big and are months old.
3 of them look just fine now - its 2 that just look terrible

Thoughts?
thanks

 

[Nano sapiens]

They may just be adjusting.

Best to keep conditions as stable as possible after something like an alkalinity issue is corrected. Corals typically have great difficulty if they have to adapt to multiple changes happening all at the same time.