Anyone tried this or have any input? I just ran across it on google. Apparently this nudibranch it the only TRUE predator of aiptasia. http://www.berghia.net/marketprice.html
I have never used them. I think they are more suited for tanks filled with them. They are small and once the anemones are gone they will starve. You also need to be sure they cant get sucked in any powerheads.
The best way to make it work is the keep them in their own tank and rotate rock though it. Putting them in the display seem to more often than not result in no results at all.