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Mmm, impossible to control like that. It will foul sometimes leaving one tank without filtration. Also spreading of dissease over two tanks will happen this way. If they are close enough together and you do want one filter, you could connect both tanks with an over flow pipe and just suck water from one tank and put it back in the other. That way you'll have a flow through both tanks for sure. And an overflow pipe is just like an upside down U, filled with water
 
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