Brown Stuff Coming From Zoa Mouth

[cm11599ps]

I just bought some Zoa frags from a local reefer last week. It took a few days for all of them to open fully but now most look great, except for this guy.

This guy has looked like this from the get go with the polyps up front open, the ones in back closed. Now the one in the middle had that brown thing coming out of it. Should I be concerned?

 

[A. Grandis]

Looks like it actually grabbed something flowing around, like algae.
If it really came from the inside of the polyp would have to be zooxanthellae expelled or simply feces.
A shock of light or temperature would normally be the responsible for zooxanthellae expelled.

Grandis.

 

[donduncan]

My zoas will do this from time to time. I notice it after feeding the tank