Whoa. How much was your tank? I guess Christmas came early for you huh? hehe. Post a pic of your tank and that magical water bowl plz hah
and no they won't hurt each other; they'll just cause unnecessary stress. Also I'm not too sure on this, but if they are male/female then they might try to breed too early. But someone with more experience and knowledge should chip in and correct me on that one if I'm wrong.