If you didn't put fruit flies in the tank and there isn't any rotting fruit in the tank they aren't fruit flies. My guess would be fungus gnats. What sort of soil are you using? It really doesn't matter as you have two choices - put something in the tank that will eat them and hope for the best, or tear the tank down. There are chemicals that will take care of the problem, but if you ever want to put animals in the tank I wouldn't recommend them.

Best,

Chuck



FROG DAY

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