You only need an emergency drain for a Herbie overflow. The emergency drain would be taller than the main drain. Do a Google search so you know what I'm talking about. It would be a pain in the butt to rig up a Herbie having the drain lines separated like that though.
Are you using an ATO? If not, make sure the return chamber holds plenty of water or you will have to top up way too often. Evaporation will show itself solely in the return chamber, and you can't have the pump running dry!
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~ Mindy
SPS fanatic.
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