Yeah I think I noticed they were easier to see at night. I would see them in the overflow at first and see egg circles on the glass. Hopefully they weren't an expensive snack good luck!I have the two Potters wrasses, they aren't active at night when the Berghia are, but nonetheless, they may have eaten them...
That being said, I am doubtful that they are still in there an building up their numbers because we have a newborn so I am up all hours of the night, and I creep on the fish at night and I haven't seen an active Berghia in a month.