I don't know. Apparently kribs are slow to grow, and I think I've been underfeeding mine so they're smaller than I read they should be at their age. I've been feeding them more recently (very cute to see their full little tummy), so hopefully they'll catch up. Sorry, I can't really give you a date. I'd say a couple of months maybe, but I'm really not sure. You're welcome to come and have a look at them if you want.Crazy72, when will your kribs reach adulthood?