What is on my zoas

[WilliG]

It appears to be some sort of sponge to me. These zoas have not been opening up as much lately, and not spreading as they should. What is it on them and how to get rid of it.

 

[Kremis]

Yeah you should just pull that off, it looks jike a sponge

 

[WilliG]

I plan on it when I get home from work this afternoon.

 

[WilliG]

Got it all off with a q-tip.