I need advice about bullfrogs as pets.?

A month or so ago I bought two bullfrog tadpoles for like 30 cents each. One has only one eye. They haven't started to change into frogs yet, but I think I'm seeing bumps where limb buds will form soon. They're really really big, so I know they're old enough now to start the change. My concern is for the one eyed tadpole. I have asked before and found that he probably won't grow another eye. I'm starting to worry now that they are probably beginning to turn into frogs that the two eyed frog may eat the one eyed frog because he'll probably be at a slight disadvantage, since they hunt with their eyes and stuff... Should I keep them separated when they turn to frogs or will they be okay if they're the same size? I know it's a little silly to worry about a 30 cent tadpole, but I really like them and don't want to have one get eaten because of me. Also, if I do keep them together, about what size of a tank do they need, and if they're males will they fight each other?