Sometimes it's one specific bad apple baby that is nipping, so if you can identify that one you might want to set it up alone. If the babies are all trying to nip, be sure to up the feedings and keep lots of greens around the tank. Sometimes you can put in an entire collard, turnip or mustard leaf wet in the tub, and the babies seem to munch on it through the day, hide under it, etc. It's like something to eat and a play thing at the same time.
Sometimes you'll get nips no matter what, but it doesn't happen all the time.
