The first fight I have witnessed in the tank was when I took the pictures of the trimac and male rd liplocking. Other than that I have only saw a little bit of chasing. The most aggressive have been the female rd and the male amarillo but only because they have fry in the tank. The overall aggression level has been minimal.
I am using a Canon 50D camera with a Canon 100mm 2.8 macro lens. For the full tank shot I used an 18-55mm lens. I am also using three remote flashes on top of the tank.