Something growing on my zoa colony

[Sinnwee]

Hi fellow reeders

I'm back with another question that hopefully you guys can help. Attached is a picture of my zoa colony and I notice something growing in the mid of it. My colony has shrunken and I was wondering if this is the cause of it?

 

[Cell]

I'm not seeing what you are talking about.

 

[Sinnwee]

Hi. Highlighting it..