First I want to thank R2R for creating such a sweet forum. Are Aiptasia invading your tank? Berghia are a natural solution... Berghia Nudibranchs, as they are known in the aquarium trade, use to bear the name Berghia verrucincornis, and were renamed to Aeolidiella stephanieae. But they will probably always have the common name "Berghia". They are an Aeolid nudibranch with multiple cerata on the body which serve the purpose of digestion. Berghia are best know for their single incredible appetite for the pest anemone (Aiptasia pallida). Most nudibranchs are highly speciallized in their diet, and Berghia are no exception. They have one diet and one diet only;.....Aiptasia species anemones. Enough of a diatribe.... let the discussion begin.