Sizing overflow and return. Please help!

[Stribers92]

Hey everyone. So I've upgraded my tank to 280litre with a 80 litre sump(building). I'm a bit stuck on how big my return and overflow should be. My return pump will be 3000 lph. I was thinking 1" return and 2 overflows 1 1/4". So I have one full Syphon and one in case of blockage.

Please help.

Thank you

 

[TJ's Reef]

Looks like a sound plan to me and will be a nice 'Herbie' overflow system that way. If you have not drilled yet you could get away with a smaller emergency drain, even a 1" will handle the volume.

Cheers, Todd

 

[Stribers92]

Thank you Todd that's excellent. It will be the back of my tank that's drilled as the base is toughened so can't be drilled. But still it's the same principle I think.