I've heard they pick up growth after the first month, that the first month is just getting them developed and indepenant. I could be wrong, but thats just what I've heard
My worry about the anemone isn't its sting at all, all my worries are in the mouth. It might not sting them, but its mouth is sure big enough to have an accident, I've seen striped mushrooms eat live chromis, and they don't have much sting to them.