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Discussion Starter · #1 ·
I have a 120 gallon that i want to rig up a sump system for in order to remove the power filters and heaters to provide more room and make glass cleaning easier. My question is do I have to have an overflow? If I just have an water out tube and an water in tube, why cant I start a siphon on the water out tube that has an ball valve with which I can control the flow volume to match the water in volume to keep the water level constant.
 
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