So I just got 2 Bolivian Rams as my centerpiece for a 20 gallon tall. However, I've noticed one of the Rams (the more brightly colored one) chases the other Ram when he sees it. I haven't seen the more dominant Ram ever touch the other one until last night at feeding time. The Rams actually seemed to try and bite each other on the mouth. Is this normal behavior for Bolivian Rams?