Themonsterisme
Aquarium Advice Freak
this is my main drain, running full syphon, as you can see I have a ball valve to control the syphon.
I personally am running a Hoffer Gurgle Buster (almost same as a stockman) on my secondary drain. its dead silent and is mainly just to pick up whatever the main drain doesn't.
So huma all you did was match the two drains flow rates?