Are the aiptasia only on one piece of lr
? If so I would just remove the rock. i have read when you try to kill them in the tank they can have polyp bailout. they sense their demise and release polyps into the water that will spawn new aiptasia. Just from research though don't know for a fact. Some of the chemical treatments may prevent bailout also. I hear people have luck with aiptasia x.
Only experience I have is one case where I tried a peppermint shrimp and after a week the aiptasia was still there so i took the rock out of the tank and chipped off the piece of rock the aiptasia was on. Since then no more. Peppermints are definitely hit or miss apparently.