That's roughly a 180 gallon tank outside dimensions.
1 inch should do just fine. I have a 250 gallon Herbie drain with 1 inch drains.
The return pipe is 1.25 because of the pump outlet but reduced to 0.75 @ the end.
Hope you are going with a Bean style drain.
IF you are going HIGH flow returns then go with 1.25 on all plumbing.
It depends on the flow wanted but I happen to like Deepwater DC pumps.
With everything going on right now I don't know if you can get one,
Varios is another suggestion.
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