Overflow pipe depth in sump?

[glb]

I have a 20g tall sump I'm building for a 40g breeder. If the overflow section of the sump will be 8" high, how far below the water level should the overflow drain be? I've ordered a filter sock/holder and am also wondering about the length of sock i should get. Any thoughts?

 

[KorL]

best to have the drain right below the water line. if you have the drain above, you'll hear water splashing. too far below, you'll hear a lot more bubble gurgling

 

[TaylorPilot]

I agree, right below the surface. Especially if it is a full siphon. They can be impossible to start up if they are too low below the surface.

 

[kschweer]

best to have the drain right below the water line. if you have the drain above, you'll hear water splashing. too far below, you'll hear a lot more bubble gurgling

Same here.

 

[HiddenUser]

I agree, right below the surface. Especially if it is a full siphon. They can be impossible to start up if they are too low below the surface.

This.

 

[glb]

I agree, right below the surface. Especially if it is a full siphon. They can be impossible to start up if they are too low below the surface.

It's not a syphon. The tank is drilled. But i take it the depth is the same???

 

[TaylorPilot]

I would do it the same way.

 

[AZDesertRat]

My drain is vinyl reinforced tubing and lays right on the bottom . The tank is bottom drilled so from the bulkhead it drops vertically then makes a nice gradual sweep or 90 degree bend so it lays on the sump bottom. It discharges close to the skimmers intake so gets processed quickly.

 

[mfinn]

My drains go about 9" under the waters surface in the sump, which is a little more than half way.

 

[Psiber_Syn]

I tried to fix mine from gurgling with a t fitting that has a pipe going up out of the water to let air out sadly it did not work and now every few minutes I get a huge gurgle anyone know how to fix that?