How tough are Aiptasia?

[canadawest]

In my little nursery tank I have Aiptasia growing, and when a new brood is on the way here is what I do.

Take the rock out and run hot tap water over the little buggers until you see them detach and fall down the drain. Place rock back in tank.

Unfortunately you have to be careful of beneficial flora and fauna (such as worms and feathers) and the coraline where the hot water hits usually turns bright green but the Aiptasia doesn't make a return visit.

Then there is the natural route. Get a couple peppermint shrimp, they make short work of it.