Bala's are giant stupid (I love them, but they are not the smartest fish in my tanks) fish that will eat anything that fits in their mouths.. heh.. I lost several smaller greeneyed rasbora's a while ago because the bala's were chasing htem trying to eat them. The Bala's never really ate more then about 3.... But they would scare them so bad the fish would jump out of the tank and into the three 165 watt VHO bulbs I used to have in teh canopy.
I was removing little dried up fish for a few weeks there... not fun.