Got a great deal on a Texas today, a little larger than I wanted, so I had to put him in with my new Mayan instead of my other tank. Right off the bat they started getting into it and battling for dominance. I think the Mayan will win, but I hope the Texas will be fine in the morning. I put some fake driftwood in there to give him some hiding spots in case he needs it. Not sure what else to do in the meantime. I am thinking of throwing my Bocourti in there to break it up. Unless that sparks more drama. 
http://www.youtube.com/watch?v=iB-RF64w7V8
http://www.youtube.com/watch?v=iB-RF64w7V8