I am now a believer. I ordered 3 bergia nudibranchs in Oct. They basically disappeared, with no signs of life while the aiptasia multiplied. My tank was overrun with aiptasia, numbering in the several dozens. The anemone were at least 1" tall. About Christmas I was surprised to see one of the bergia, about new years, I saw as many as 8 at one time, the largest over 1" long. By the end of Jan. all the aiptasia were gone, and unfortunately, the bergia has all died too. But, they did clean up my tank!
Date Added: 01-31-2015