I would have oriented the drain to be a short run to sump, down more than over and down. If I had to run like that I would have used flex tubing. I had a rack with a dozen 40s and 6 30s all breeders, and they had real long runs to a shared sump- a couple times there were issues with bumpage and bulkheads. The big thing is these tanks are shallow- and use thin glass. Best plumbing is the least.