So, I've been browsing the forum and youtube to get some ideas on plumbing. I've noticed that so many people are plumbing with hard PVC, is there a benefit to this over the flex tubing included with my drilled, reef ready Aqueon 90? I have a Eshopps R-200 3rd gen sump I'll be setting up (delayed a week due to stand not finished w/ staining) and I want to make sure I don't run into any issues. Also, is there any recommendation for using a thread sealant with the tubing or PVC for the overflow plumbing? I'm assuming not, but figured it'd be good to know before i dump water all over my floor. Thanks!