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Whenever I give them some of their favorite food (like apples for instance), I always give them two seperate slices.
If this happens just when you offer them the apple as a treat - try offering them smaller pieces so you can give them each another piece when they finish the first one. Hopefully they will learn to come to you for more instead of stealing from each other.
If they are fighting over the foods you are serving for their dinner - try cutting the fruits and vegetables in smaller glider hand size piece and give them enough that there is a small amount of the fruits and vegetables left over each morning - that way you know they have had all they each wanted and needed to eat over night.
You can also put their food in 2 or 3 different locations in the cage - one dish on the floor, one on a shelf or hanging midway up the side of the cage and one in a hanging dish a little higher or on the opposite side of the cage. One glider cannot guard 3 feeding stations to keep the other from eating.