I have been researching a lot on this topic. I have zero experience doing this so it has been pretty overwealming. I have heard arguments for everyone configuration you can imagine. I am trying to keep it as simple as possible, but definitely need it to be quiet. All of the plumbing will have to run under the stand to a sump. I’m making a 125g sump. I plan to custom build the stand to a 4 ft height to allow easier access for maintenance and also raise the height of the display tank for better viewing. If you have an opinion on the best plumbing option for this setup, please let me know.