You need gate valves or ball valves to control the flow rate. Am I missing something?
I'm just trying to get rid of the bubbles into the sump. That diagram I uploaded is exactly what is in the system right now, but it's pushing a ton of tiny air bubbles into the display tank. I was told that a reverse Herbie (like in the diagram) would fix it, but it didn't change anything at all. I'm sort of lost on this.