Andrew Puhr Posted September 9, 2021 Share Posted September 9, 2021 I bought a used 40 breeders that is drilled in the back upper corner and has a 1" bulkhead. It has a barbed fitting on the outside that I was going to put some pond tubing on and then run it into a 10 gallon sump I am using. I am trying to size my return pump right but I want to make sure I am planning this correctly so I don't overflow the sump or the display tank. I am just looking for some guidance for this planning. All the research I have done has shown anywhere from 300gph to 600gph which seems excessive but I don't want to get a large return pump if I am not going to need it. Since I am using flex tubing for my overflow and return I don't have a lot of options for restricting flow. Any help would be much appreciated. Link to comment Share on other sites More sharing options...
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