I have to say i was not optimistic about buying the Berghia Nudibranchs after trying a high powered laser, Joe's juice F aptasia aptasia x and they just kept coming back and with four wrasses in my 265gl mixed reef tank i was a little worried that they would be a expensive meal so i went to salty underground and purchased 50 1/4 inch Nudibranchs and hoped for the best ,to my surprise after 12 days i don't see some of my big aptasia that were on my rock work ,every day i dont see aptasia were they were the day before, now if they stay gone were in business