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Can you maybe post a picture of the gap? Is the lid bent or warped? Most of the tanks I have the lids have a slight gap (up to a finger width) around the tank where the lids slides over the tank. Thats to make the lid easily removable and not a press fit. The lip that hangs down on the lid isn't where the tank makes the seal. The edge around the screen and top rim of the tank is what makes the seal.
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