2 easy ways to get rid of them without bying stuff like Joes Juice. Mix
Kalk with water till its like a paste. Use a syringe and inject it in
the center of the disk. They will wilt away and die. That is the hard
way.

The easy way is to get pepperment shrimp. They will rid your tank of
aiptasia one and for all. My suggestion is to get 4 or more. They breed
readily and the small shrimp work on particles others miss and they are
great food for the fish.