I tried the nudibranches but only got 4 of the tiny buggers. Well I have seen 0 impact and would probably need to spend a small fortune in these to maybe see a difference so I will resort to the proven method. If anyone has some that actually eat aiptasia or know of a shop that has the right species please let me know.
I had good luck with a pair I bought this weekend from Liquid Kingdom. My aptasia problem was very minimal but the ones that were annoying me yesterday were gone today, so I think it was successful. Which is good because I was going to have to drag out my tiny frogspawn and subject it to a good scrubbing. They were like little surgeons and cut it out without the damage I was likely going to do.