New GBTA poops everyday... but I don't feed everyday...

[Mastermind]

Same as title. Just bought this thing for my 35 hex. It's inflated 90% of the time (that I'm home to see it). But usually when I get home from work, it's closed tight with brown/black stuff coming out, assuming it's poop. Only problem is, I don't feed it every day, so why is it pooping every day? I know it's not eating any of my inhabitants, since I see them all every day.

Any ideas?

 

[cowboyswife]

How often do you feed it?

 

[wicked_NaCl_h2o]

maybe its not just poop..it could be loosing its zooxanthellae. A pic would help