what size whole is best to drill for the return to your tank? Tank size is about 75.
Gonna dril the overflow that’s gonna be 1inch but what should the returns be?
Gonna dril the overflow that’s gonna be 1inch but what should the returns be?
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If you are already drilling a 1", just do 1" for the return. Even if you plan to run a 3/4" locline inside the aquarium, having 1" pipe from the pump to the bulkhead will at least reduce friction losses a little bit. You can just put a reducer on the loc-line fitting.