Pussies. Tell them to stand up and fight!
A little off topic, but I remember my dad had South American Piranahs or some shit when I was a kid. It was awesome to watch him put in the feeder fish, watch them chase em around and bite their tails off so that they couldn’t swim, and then when they were hungry later on, they didn’t have to fight them. Just swim on over and have some lunch.
Also, there was this one time when my cat caught a live mouse. It was thrown into the tank. AWESOME. Not the most clean or safe idea, maybe, but it was amazing.