First off, welcome to the Aquaponic gardening community! Wow, I can't believe I beat Sylvia to the punch. Anyway, the hole I dug will be for my sump tank. I'll put the fish tank (another IBC) on top of this. I've now run the plumbing (underground) with three inlets and a single outlet into the sump. I'll post more pictures soon. You've probably seen my pictures and video of my current system. Well, since the ground is relatively unstable here in the South, one of my grow beds started sinking into the ground after a heavy rain. Now, just like the six million dollar man, I'm building a new system that will be bigger, stronger, and more user friendly than the last.