I was in the same situation a few weeks back... Just ignore them, let them go to town... I've attached a pic of my two kitties after they got bored of killing each other...
See picture at this link
My 2 demons
So we've recently introduced a new kitten into the household. She is 2 months, fairly small, very confident, wanders the entire house, just a little explorer.
The old (4month) kitty, is how should i put it, psycho, due to my roommates wonderful training. The 2 cats will eat side by side with no...