Well, finally my mom who knows the owner of the pet shop was able to contact her directly, and she agreed to take two back, so now it's just the one gourami. He definitely seems happier, and the betta's behavior has changed completely since I moved him to his own, smaller tank. If anyone has suggestions on fish I could put in with the one gourami (other than female gourami, I'm already aware of that) in the future, that would be cool. Thanks for everyone's help. 
