What I was trying to explain was in effect two things. First, I think if you put a valve on your return line, to regulate the flow back into you main tank from your
sump, you can better control the dursos.
In my system I did something you SHOULD NOT do, which is regulate the overflows back to the
sump. As you see in the photo, the valves on the overflow lines regulate my water so I don't have the flushing effect, and I can stabilize my overflow levels. The problem with this is, I am leaving myself open to having my system overflow if my overflow lines get plugged. I was not as worried about this as I have two overflows and my
sump is small enough that my pump will cavitate (pull air) before my display overflows.
Secondly, look at the photo above, and notice the left overflow line turns intot he sum and then turn paralell with the water and I have a turned up Tee. When I added that configuration, the tee really quieted the
sump down and eliminated my bubbles. The bubbles were eliminated so well that I have since removed my baffles in the
sump which typically are used to eliminate microbubbles.
Hope this helps...
