So I just pulled a zoa eating nudibranch off of my glass. Not sure how the guy got into my system. The only dip I did on my zoas was a FW dip for flatworms, so he could have come in on a frag. He could have just as easily come in on my live rock I guess.

Oh well, I'll have to monitor the situation and see if more pop up. I guess I wont be buying any more zoas for a while, just in case.