Plumbing...suggestions? Added a drawing...

[mseepman]

I know you have even a better handle on this stuff than me Myka, but remember to account for a back siphon if power goes out through your return pump. When I made my sump, I figured out how many gallons of water were represented by each inch in my display and made sure there was that much room (gallons) plus more in my sump/fuge.