I have tens of thousands of eggs, I'll have to see how many adults I still have. They live DEEP inside the rocks. I captured about 30 for the meeting yesterday and thought I had them all - but when Skip took a Dremel to one of my LPS colonies - about 10 more adults came out. Last week when I popped a big zoa rock into pieces, a bunch of adults were in the middle also. I'll see if I can get more.
They're very good hunters and ALL OVER the tank so I would bet that they kill every last aiptasia before they die out. I even put an egg sack in my sump and they took care of that area.