I made a new display tank out of plexiglas. My original tank build was impossible to maintain since theres was 4" of space to on my sump plus the plumbing was in the way. Instead of running the plumbing Strait thru the bottom I decided to make an over flow. I made the back pane half inch shorter. Im debating weather to leave the sump on the back for easiest access or underneath. But if I did it underneath I would run the plumbing in thru the back pane of the sump. That way I have clear access to the sump.