Use either Joe's Juice or a product from Blue Life called "Aiptasia Control". In reality, I think the Blue Life product is just kalk
paste, but it works great. Just put it on the aiptasia and its gone. Heard only good things about Joe's Juice also.
Peppermint shrimp may eat them, or may not. Heard mixed things about that. All I know is that I originally nuked the aiptasia with the Blue Life product when I set up my tank. After I got a peppermint, I've only had to nuke two little ones that were in between my zoanthids. The rest of the tank has been free of them. So, I think mine is doing its job.
Whatever you do, don't manually pull them out. They'll spread like wildfire if you shred them.