Having spent almost $200 on berghia's to put into my 200 gallon aiptasia farm was pretty much like going out to the barbecue pit, firing it up, wadding up a couple of Benjamins, tossing them in and walk back into the house. Literally was a waste of money. I tried to keep them contained to collect some egg spirals, which they did lay a bunch of eggs. So I decided to release them into the wild. Within about an hour they had all made it from the sand bottom onto rock. Then adios, never saw them again, never saw any egg spirals on the glass, never saw aiptasia go away, just my $200 went away.
So I nuked them with Joe's Juice. Hit them again in about 2 weeks, then we moved. When setting up the tank I hit the remaining ones with Joe's Juice once more. I still saw a few growing, but they weren't multiplying. About this time I went FOWLR and got a Koran Angel. Haven't seen an aiptasia since that fabulous day.
Good luck, but for a large tank, I think that you need a larger predator such as Peppermint Shrimp, CBB, or other angel fish. Of course if you are reefing I would avoid a large Angel.
Bill