Not even sure if 'mouth' is the right word. But a bunch of the closed up zoas in this colony have some kind of brown clumps in there. Thought maybe it was spiders but a Bayer dip didn't get any reaction out of them. Please see pics!
Before Bayer dip:
Immediately after dipping, back in the tank:
Next day:
Before Bayer dip:
Immediately after dipping, back in the tank:
Next day: