Hi... I finally finished my first sump and plumed it into my display tank.. I have a 125 gal long tank with to overflow boxes in each corner...my problem is that in one side of the tank my water is overflowing into the box and daring but on the other end the water is not overflowing in to the box...here is a pic of my durso standpipe
... According to the place I got it from is not adjustable... I was thinking of adding a valve to the side that is draining and slowing the flow enough to see if it overflows on the other side... Anybody have any experience with something like this...