Quote:
Originally Posted by Reef Pilot
OK, I took another pic, this time with the elbow in place of the cap at the end of the slotted overflow tube. You can cut the top of the elbow to get the 2nd level emergency height to whatever you want.
It doesn't matter where you place your return pump. It is the overflow design itself that regulates the water level in your tank. In my case I actually was using a canister filter, and just stuck the input hose into my sump, with the airline plumbed into the intake side. This way I could switch the input to either my tank and use it as a QT, or to the sump and use the tank as a refugium. Many ways to do it. As long as the siphon airline is connected to the intake side of the return pump, you can't go wrong.
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I like this design with the slotted tube & elbow as emergency. Was thinking it could even be modified by having two emergency drains. The elbow at the end of the slotted tube looks good, but what if you were to replace the 90 that the slotted tube is plumbed to with a Tee? That way the open end of the Tee would be your emergency. Might be better in case the slotted tube gets plugged internally. In that scenario, your elbow at the end of the slotted tube wouldn't help. Anyhow, you could do both & have double protection.