Everyone has been asking me about the new sump, and what its layout will be. I'm still thinking about my options, and nothing is set in stone. I really like the idea of a tunnel for some reason. If I can pull that off, so be it. If 1" of water drains from the display tank, that equals 13g of water. Plus whatever is in the plumbing. The sump needs to be able to hold any drainage when the power goes out. The footprint inside the stand is 81" x 32", ...