Yeah getting a natural predator is the best solution.I use a peppermint shrimp in each one of my tanks. I currently have 3 tanks
50g lowboy with 1 peppermint who has eliminated all aiptasia not a single piece in the tank in at least a year.
65g with 1 peppermint (originally two but I'm pretty sure he got too close to my pistol shrimp) they eliminated all aiptasia and I haven't seen one in this tank in about a year.
20g cube with a single peppermint shrimp and a single piece of aiptasia which he doesn't seem to pay attention to.
66% success with peppermints and they 100% do not touch any coral.
Maybe@ecam , you have sps?