I’m tellin ya I had a great experience with berghia nudibranchs. Was skeptical as everyone is but I spent the money on (4) 1/4” in my 90 gallon. 2 months and completely eradicated! Moderate infestation. I had at least 2 aiptasia that the oral disk was the size of a quarter. My experience but will definitely try them again if the need arise.
I thought I was free since my berghia purchase a few months back, I hadn't seen anything in ages. Looked in the tank last week and spotted a tiny one, looked in the tank this week and that guys on steroids because it's huge now. Getting ready to make another purchase of them.