anybody had success with Berghia nudibranchs?

[Delphinus]

I tried one berghia a few weeks ago but it disappeared overnight never to be seen again. Apparently that's normal but unfortunately I think it perished because the aiptasia count is as high as ever and growing by the day. I'm willing to give berghia another go but maybe this time I'll try 2 instead of 1, maybe they need to feel secure to come out or something.

FWIW, I've never had any luck with peppermints controlling aiptasia.