Best way to kinda maybe know is to keep track of as many aiptasia as possible, and then check again each day to see if any are vanishing.This is all very reassuring that the berghia I bought will eventually do the trick....but at this point I'm not even sure they are still alive. I have 120g DT and introduced 10 berghia about 2 weeks ago. They promptly disappeared into some rock never to be seen again. I only have 3 clowns 2 damsels and a rabbit fish at the moment. Crabs, snails and shrimp of course. Do you think the berghia are still alive? They're quite expensive where I live so I dont want to buy more if I dont need to or if one of my critters things they're yummy.
Aiptasia tend to not move very much, so if they keep on disappearing, it may be a sign they are eaten. XD