Here's the thing. I've never had aptasia in my tank. Never a sign. I was careful when buying my live rock, I made sure I didn't have ones with aptasia. I know some of you may now be saying "uh duh..you had an aptasia eating nudi!!" But I seriously doubt that, I don't think a single aptasia could have slipped my vision, esp in such a small tank. Plus I've had these rocks for at least 2 yrs by now. I still believe this is why my Bali xenia wasn't thriving and also explains the jizzing incident w/ my Xenia, it was this Nudi pooping.