I haven't had good luck with peppermint shrimp in my tank, not sure why but they just don't last long. Maybe that explains the recent aiptasia problem though: I got tired of killing peppermints so quit replacing them.
The aiptasia are also in my display tank: growing between my zoas (and stinging them, causing them to stay closed), on the edges of my montis, on my closed brain...can't just use my frogspawn to kill them since then it'd kill my other corals too. I'd take a pic if I weren't so embarassed about the plague in there!
Aiptasia in my fuge wouldn't bother me if they'd stay there. I think that's where they started actually, but they aren't happy to just live there. No, they have to take over every part of my system with lighting. Not to mention they grow all though my chaeto. It's so frustrating to see people paying for chaeto while I'm throwing it away by the bucketful b/c of the aiptasia.
Trust me, aiptasia in a fuge doesn't STAY in the fuge. I think you'd have to have a microfilter on it to keep the baby aips from moving. I've seen the babies floating through the tank--they're so tiny, not much bigger than an amphipod. They are moving from the fuge, through my 100 gal sump, then moved via a hammerhead pump back to my display. They survive all that! Little buggers...
I do appreciate the suggestions, but I've tried them all (except for the CBB, which I don't want to do b/c he'd probably start snacking on my feather dusters and corals and he'd add to my bioload which I don't need). I'm keeping a close eye on the basement fuge for more aips, the berghia will be here on Friday and most will go into the display and a few into my above-tank fuge. I'll keep you posted.