Sorry about the cheesy movie reference, but I just got home from work and found one of my tiger barbs dead. After fishing him out, I noticed it's face was eaten all the way to the eyes. After looking over the other 3, I found out two of them seem to have bite wounds right on their mouths. So, between my Senegal Bichir, African Brown Knife and Ompock catfish, I have a face eater! I doubt the barbs did it to each other and the only other resident of the tank is a clown loach.