Now for a few work in progress plumbing pics. I have the overflow return to refugium and sump pretty much dry fitted and ready to cement as long as I (or anyone else for that matter) do not see issues with it. Basically the "herbie" overflow is controlled by the 2" gate valve right under the bulkhead there and then the return tees to the refugium (right) and sump (left). The refugium is reduced down to 1.5" flex PVC and flow is controlled with a 1.5" ball valve. Right now I only have the 1 2" union but I may add another. The sump drain will not be left like that, it will have PVC running down into the sump, Im just holding off on that at the moment. As you can see in the first pic, the overflow is not built yet. I want to get the plumbing worked out and then I will go buy the glass for it. I still need to build the emergency drain but will not do so until I build the overflow so I know the height that is needed. The emergency drain will just go into the sump but water will fall a bit, splashing to let me know that for whatever reason, the emergency drain has been needed.
Anyways, let me know if you catch anything I miss...
