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1 inches, 100mm? You sure this is right? 100mm for overflow and return?
Both the return and overflow at the same size?Simon is just messing with you.
Either 3/4" or 1", I run my 250 with 1".
A lot will depend on your return pump flow.
HerbieWhat kind of return will you use, Herbie, Bean, or an overflow HOB?
Thank you. Will have a lookHave you read this?
Herbie Overflow Plumbing Guide for Quiet Reef Aquariums - gmacreef
The Herbie method can quiet down your aquarium drain and eliminate microbubbles. The guide includes helpful diagrams and explains each component.gmacreef.com
1 inches, 100mm? You sure this is right? 100mm for overflow and return?