There are many ways to get rid of aiptasia, kalk, joes juice, peppermint shrimp, hot water, lemon juice, lime juice, nudibranches. I had pep's and thay ate alot of my zoas. They will eat anything in the anemone family which includes zoas and mushrooms.
Can you take the rocks out of the tank without causeing great damage? I would say the best thing to do is to take the rock out, inject it with kalk or joes juice rinse it and put it back in the tank.