@tbrown, a question about your Berghia. Did they look just like the pictures with lots of fine cerata? This is going to seem nuts but I woke up this morning thinking about the Mystic Sunset in my tank. The two Berghia I introduced on Thursday came from a well-known coral farm so I can't believe I'm thinking this but I remember that when I dropped them in I thought how one of them looked just like MEN with just a few large cerata. I'm not sure anymore what the other one looked like but I think it was 'fuzzier' The nudibranchs were tiny, only about 1/2" long. The thing is it dawned on me this morning that one of the nudibranchs, the one that reminded me of a MEN, landed on the same rock where the Mystic Sunset is and only a few inches from it. That was on Thursday. This was the monti on Saturday morning:
It sounds like paranoia but now I'm wondering. I've been watching the two new fish, the CBB and the bristletooth and neither of them have seemed to show any interest in the Mystic Sunset.