If you go with a small return section in your sump your pump will get starved of water before your tank overflows... it's my "herbie" system failsafe. My pump cannot overtop my tank since there isn't enough water to do that. As long as you have an ATO shouldn't be a problem keeping levels. same as how we build our sumps to be able to hold enough water with return pumps shutting off, you can do the tank the same. 1" in a large tank is a LOT of water.
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