The "Whipping Boy"

[channarox]

you can tell who has been getting abused and whose been all the abusing

 

[cichlid savage]

My bass go at each other all the time. usually its a bump or two but every once in a while they get kinda rough. If they start getting too rough you could try blacking the tank out for a day or so and rearranging the decor. it will throw them off a bit and give the whipping boy a chance to heal.