Plumbing/Noise Question

[sphelps]

Actually just to switch things up completely if you can plan out the sump design so the first chamber water level is at the same hieght as the desired overflow water level you can just run all three drains directly into the sump without any standpipes or valves needed, you will have to drill into the side of the sump though but you could also tee everything together into a nice big solid 2" line. Very similar to an AIO setup.

This is probably what I would do....