Just because I thought about it today, according to this thread I added 3 berghias sometime around mid Sept. The aiptasia got pretty bad during most of October. To the point I considered adding peppermints.
Then, within the last week or two... all aiptasia are just... gone! YAY! I didn't even notice a gradual decline.. just GONE!
I added the little critters very carefully so they are in the same lowish flow spot on a rock right before lights out. I read that the key is they need to get reproducing, so I figured they had the best chance of that if I kept them together. I saw a berghia on the glass a few weeks ago (still plenty of aiptasia... I kind of rolled my eyes...) haven't seen another since though.