I cooked my rock for 1 month and 1.5 weeks . I recently put my live rock in my DT and today I did notice 1 little tiny aiptasia still alive. I have not seen any other but before I cooked my rock it was pretty bad the little buger were everywhere. I am going to purchase some of these slugs that ONLY eat aiptasia. They are supposed to eat them right down to the root, from what I hear the peppermint shrimp sometimes cant get down to the root and the aiptasia grow back. Here is a link im about to make an order through these guys. These guys sell a aiptasia clean up crew for 89.99 4 peppermint shrimp and 4 berghia. These guys reproduce quickly as well so you might end up with alot more than what you purchase.
http://reefscavengers.com/berghianude.html <~~these are juveniles