As long as blood isn't drawn they should be safe to stay together. If one bites the other and blood is drawn or there are obvious signs of some major bullying then I'd separate but otherwise it'll be nice for them to stay together if they seem happy together
I won't go into details as Piebald has kindly linked a post I wrote recently anyway but I can elaborate on stuff or try to think of more to help if needed. I've kept a few pairs/groups now and they've taught me a lot
Thanks for linking that post Piebald, I'm glad you think its an interesting post