set up plumbing questions

[likemike99]

So I moved into a new house and am adding a new tank. (will be in another thread for the build). I found a good deal on a 180gal with dual overflows. each side has one big hole (1"?) and one smaller hole (3/4"?). it was set up for the smaller hole to be the drains and the larger holes for the return. Is this typical? Does it matter which size is the return? My other question is for the drains. would you a) set them both up as equal durso types? or b) set one up as a durso type and the other one as a herbie for overflow? or c) something different?
I had a 75gal about 10 years ago but it only had one drain/ return. been running a biocube the past few years due to moving alot, so this is my first venture in multiple.

thanks

 

[ShakeyGizzard]

The 3/4 should be your return, 1 inch is your drain. i would not have my drain smaller than my return

 

[Vivid Creative Aquatics Verified Sponsor]

@ShakeyGizzard is correct - typically you would use the larger hole as the drain - simply because it has less chance of being overrun by the return rate.

 

[ShakeyGizzard]

I have not delt with multiple drains, but quite sure they can easily be silenced

 

[likemike99]

that is what I was thinking about the sizes. I think I am going to take the easy way out and just use 2 durso drians. thanks for the inpuit

 

[KStatefan]

I would most likely set it up different and run returns over the side and set up a Herbie in both sides with the small pipe the siphon and the large the open drain.