There is one thing that I see with your enclosure that might cause you some headaches. The background that you constructed is going to allow the flies a quick means of escape away from the bottom. Normally this would happen to some degree anyway, but I think this is going to be compounded in your case.
I don't know if you have a cover for the 10gal, but you might want to get one. I wound up putting it on my 10 gallon and then closing up the seams with scotch tape to keep the flies inside the tank.
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