I ran out of of blue pvc for the upstairs run from the floor. I ended up using flexible PVC from the floor up to display tank and colored hard line in basement sump area where it’s cool to see all the workings of the aquarium. My stand will hide all upstairs plumbing and using flex made it have less head loss and made any moving of aquarium easy due to non rigid tubing.Good to know I don't have water in mine yet, I ran out of the pipe I was using, and my pipe stretcher broke, so I had to order more but water soon.