Nudibranches - do they survive?

[Pisces]

I love nudibranches, I think they are gorgeous creatures. I've often thought about putting one in my tank before, but I've heard that they don't do well in captivity. Has anyone had any luck with these?

I was told that it's their diet that causes the problem...they don't get whatever it is that they need. But, my boyfriend recently read in a book that they eat star polyps....any thoughts?

Thanks