I think the take home message is, they're pretty weeds. They grow fast, they are extremely hardy unless they're being harassed by something or are weakened by something. It really doesn't matter. I let me temp swing around all over the place on my tank because I don't want it to be a ball and chain. My corals and fish are doing great. If I lose a colony every once in a while, I'm left with stronger corals and I'll put something else nice in it's place. I don't lose much, though.
You could take the zoas out and throw them on the floor for 3-4 hours then put them back in and they'd be fine in a day or two and a week later they'd throw off 4 more polyps. They're not that picky.