Here's a quick, albeit, temporary fix if you have aptasias or other "problem anemones". I had about 100 aptasia in my 95 gal. tank. After trying the Bergia slugs to no avail whatsoever (haven't seen any of the 5 I put in the tank. Plus, they were so small...about the size of a rice grain...so in my case...a waste of money).Call me a monster, but this works: buy a drill pump (it's a device that you hook up to your electric drill for pumping water, oil, etc...~ $6.00 @ Home Depot).Next time you do a water change, attach hoses to the drill pump, use the strong suction the drill provides, and suck the anemones right out of the tank.You won't get all of them, and you will leave some parts behind, but I put quite a dent in my aptasia population ! I've done this 3 times, but now I think I'll try a copper-banded butterfly to finish the job. Good Luck !(Be careful not to drop the drill in the water..you know, being electric and all !)