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 wait 30-60 minutes for it to fully harden before resuming flow in the aquarium. If it starts to lift and blow around like snow, turn off the circulation pumps for another 15 minutes to allow it to finish hardening.  After a few days, break up the caps to siphon it out. The aiptasia will be gone. 

Do not use F-Aiptasia on corals.