Best overflow plumbing for a reef ready 120

[George]

Are all 4 drains the same size? I know some RR tanks have different drain size in a tank which makes setting up Herbie a little difficult(not much but extra planning).

[Proteus]

No there diff. Prob 1" and 3/4"

[smokinreefer]

Originally Posted by Titus99

No there diff. Prob 1" and 3/4"

Yeah, I think that's right.

I plan on using the 1" drains with gate valves.
Using the 3/4 drains as the emergency drains.

Plumbing my returns over the top.

[smokinreefer]

Will adding a "durso" to the drains accomplish anything?

(or just leave the gated main drain as just a straight standpipe?)