I just recently went the superglue route on a new frag of zoas I had in my coral QT. Saw one aiptasia about two weeks in and hit it with superglue. Put it back in the QT. A week later, saw another one on the same frag so I hit it as well. I believe both came on the frag based on the way the zoas were growing when I got them. Waited another three weeks without another sighting. A good tip I found was to hit the frag with a turkey baster to get everything to close up and then observe. In my case, the aiptasia were the first to emerge so I could see exactly where they were coming from. I hit them with the baster one more time to get them to close up, then applied the superglue on top of where I saw them come out. So far, I haven't seen them spread, but will let you know if that changes.