Hi,
Yes, I finally do have something to update on this tank!
The water is in, some of the rock is in and most of the plumbing is done. I still need to run a line over from my RO unit for topoff and a bunch of minor things. Here are some updated pictures:
The "hoop" of flex PVC that you see in some of the photos is just plugging up a couple of holes that are unused at the moment.