Fighting Bristlenoses.

[shahdi]

I have one male and one female bristle nose plecs in my 80 gal community tank. After feeding all the fish with frozen blood worms, the bristlenoses started to go at each other. They would headbutt each other with there spines at the side of the head out. What type of behavior is this? Is it the male showing dominance or what? Usually the male would just case the female away, never seen this before.

thanks

shad