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If you use the hammerhead as a return pump, I don't think the length of your overflow box is long enough to handle that kind of volume and may cause your tank to overflow. I have a 450g tank 78"X36"X36" and I have the overflow occupy the one side of the tank with a length of 36". I run a barracuda pump and the water level rises to about 1.5" above the bottom of the teeth.
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