Scissors for chopping worms. I tried a knife, and indeed it was like a scene from Dexter.
@Real124, your axie really is tiny for its age, where did you get it from? I'm concerned that if it's not growing it may have other problems. Certainly a normal axie would be 9-12 inches at a year, if you add another axie it would outgrow its tankmate very quickly unless you got a divider.