Hi,
What are they doing? How are they fighting? I have 14 FBT, 6 of those are over 10 years old. I have never seen any of them fight. I do know that when the food is in there, they will grab onto anything that moves, including my finger. I read once were it said that they don't have good eye sight and will go after things that move thinking it is food. I have even seen them get a leg of another in their mouths, and they will move around with the other toad's leg in it's mouth until the other kicks away because they can't just spit it out once they realize that it is not food.
Anyway, maybe they aren't fighting, just excited about the food.
Rhonda