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Innovative Marine Aquariums

1 vs 2 Return Lines


ReviloM

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My 65 was drilled for (2) 3/4" returns and a single 1" drain . I wanted to run a herbie so I used one of the 3/4" lines as the main siphon drain , and 1" as the emergency, leaving only one return and it has worked just fine.

 

The majority of your intank flow will come from Powerheads so the single return shouldn't be an issue .

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None as long as the single is capable of handling the rated flow without much headloss due to fittings or friction from the water velocity. I prefer two myself though as it gives me more random flows in my display with the flows converging in the middle plus controllable powerheads mixing it up.

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Most pump manufacturers recommend increasing your return line one size larger than the pumps discharge to reduce the headloss on the pump and increase the flow. Cuts down on the velocity and jetting action but actually increases the flow rate due to lower head.

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