Candy apple red palys stop growing?

[toytech]

my candy apples did the same thing, from 2 to 7 in 2 weeks , once the new polyps grew to full size thats all i got . They seem to grow very fast when new so it could be a response to the fragging , a self presevation tactic .Im thinking of cutting 1 or 2 off the mother colony and seeing if it kick starts the growth again.