Best overflow plumbing for a reef ready 120

[smokinreefer]

So with a 120,

I'd use 2 holes for return lines, 1 on each overflow.
1 drain on 1 overflow As an emergency line.

The other drain on other overflow will have gate valve.
This would be the only "working" drain? Is that right?
Unless of course something gets clogged,
then water would rise and go down the emergency line.

Would it be better to have one gated drain and one emergency drain in each overflow? And just run the returns over the top of the tank.
(Not using any holes for returns)

[Proteus]

Originally Posted by smokinreefer

So with a 120,

I'd use 2 holes for return lines, 1 on each overflow.
1 drain on 1 overflow As an emergency line.

The other drain on other overflow will have gate valve.
This would be the only "working" drain? Is that right?
Unless of course something gets clogged,
then water would rise and go down the emergency line.

Would it be better to have one gated drain and one emergency drain in each overflow? And just run the returns over the top of the tank.
(Not using any holes for returns)

Yes you got it.

You could do it with 2 main and 2 emergency. Your choice.

[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?)