It's just expelling waste . Didn't you post this somewhere else? Really, are you paranoid or something? I have this happen often, and my zoas are thriving. I'm sorry if I sound rude, but you really should listen to these people
vishnuborg, I posted the same message in two forums to get the experts opinion. I posted in Hitchhikers and Zoa forms b/c it was an unknown "worm" coming out of my zoas. But thanks for putting me in my place.