Remove all rocks with them, as stated above. Also, turn off all lighting asap, and leave it off for weeks. No need to light a tank during the cycle and the lack of light may help kill off the aiptasia, or at least help prevent them from spreading.
If it were me, I would start over completely. Dry out the tank and let it sit dry for 2-3 weeks and start with new rock from a different source.
I would also return all the rock, if you can. Whomever sold you the rock knew about the aiptasia and didnt care. I assume it was a store bc inly a store would have that much rock with no lights on it. I assume there was no light bc the aiptasia are colorless, as if they were in the dark for a while.