F-Aiptasia is getting rave reviews about how it eradicates pest anemones.
This is a 2oz package.
With the flow off in the aquarium, liberally cover aiptasia with F-Aiptasia. Within minutes, the solution will harden. After you are done covering them all, resume flow in the tank. Wait 30-60 minutes for it to fully harden first. After a few days, remove the caps by breaking them up and/or siphon it out. The aiptasia will be gone.
Do not use F-Aiptasia on corals.