Welcome
@DrTheenGrumb. Nice lineup you got there, and I like how you are trying your hand at RDWC. I've had several runs with a DIY undercurrent system. 1 inch line is too small. I run 1-1/2" and haven't had too many problems yet. I have to sideline the RDWC for a while due to other projects but I really loved that system, it is so LIVE and fun to watch. Monstrous plants. You are fine with cutting the roots if needed. If you need some visuals, I have several of the RDWC that I built for my last run in my journal. It wasn't the greatest run due to unforeseen circumstances, but the setup and whatnot should give you some ideas or inspiration on how it all runs.