I piped the mixing station in such a way that I can mix in both at one time. The left is saltwater and the right is RO/DI water, but I can open the right container to mix as well in case I need to do a massive water change. Lets hope that never has to happen. I just paid the last payment, so hopefully I will hear from them on a shipping date.
Having that 6 extra inches helps out a lot. I am not a NSA person, I went with all Marco Shelf rock. I already have it pretty much done, I just like the caves and ledges that I can create.