overflow plumbing

[Lampshade]

I had a duroso and ended up changing to herbie. If you are going to be pushing 1800gph through your sump you will need a very good bubble trap to catch the micro bubbles from a duroso. With water moving through your sump that fast you'll end up seeing a lot back in the DT. I would suggest going herbie if you can with 2x1.5" returns. It's always easy to decrease the drain size with an adapter, but once your tanks running you can't really increase it.

I would also suggest going flexible hose for your return, saves on plumbing parts in the end, cuts noise down greatly, and also increases flow by a lot without having 90's in there.