A question about my Green Hairy

[y-not]

We got this guy a few months ago. He was about the size of a quarter.
Now he's about as big around as a soda can.

Anyway, last night I dropped in some pellets for the fish and I saw him doing this:

http://www.atlantareefclub.org/forums/photoplog/images/7119/medium/1_Green_Hairy_Mushroom.JPG" alt="" />

It's the light, almost white center circle that we've never seen before.
My wife thinks it's pooping. I've see him poop before but it's never involved a bright white circular thingy in the middle.

Has anyone else seen this?
What is it?

 

[glxtrix]

Yup, just excreting waste. That's just the inside of it's mouth pushing whatever out.

 

[jfritts91]

It looks like a mouth to me. It's probably trying to eat the pellets

 

[y-not]

glxtrix;885654 wrote: Yup, just excreting waste. That's just the inside of it's mouth pushing whatever out.

That's what my wife said.
It's not stressed out in anyway. It is, fat and happy.

Edit:

jfritts91;885655 wrote: It looks like a mouth to me. It's probably trying to eat the pellets

Yeah, could be. If you look hard enough, you can see a few pellets sitting on it.
Our Duncan eats up the pellets like candy.
Heck, the Duncan eats almost anything that gets close enough for it to grab.