Tank Pump and Plumbing

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I have been searching a lot to try to get this info but I guess I am not good at wording the searches. So here goes

I have a 75g that has a single overflow box in one corner. It is drilled with about a 1.6 inch hole and about a 1.3 which from what I can find fits a 1 inch and a 3/4 inch bulkhead. I am guessing that the 1inch is for the drain and the 3/4 is for return but could be wrong on that.
Questions
1. How do I determine what size pumb I will need.
2. is teh LocLine tubing what I need and if so what size would be best 1/2 or 3/4

If these are not the right questions I am not sure what/how to ask but what i got was a 75g that has the 2 holes and overflow box with no plumbing other than a skimmer with no pump and a sump so I am trying to learn.

Thanks
Cory
 
the overflow box will need a durso and for a tank that size a 600gph pump will be sufficient. the larger the plumbing the better so 3/4 locline would be best.
 
I just got done doing my 75g so if you have questions, maybe I can help.

Did you purchase your return pump yet? I am running an Eheim 1260 and split the return.

The Durso took a little tweaking to get it to drain correctly but is very quiet now.
 
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