Thanks for the info Jim,
things are really in a very basic planning stage right now. I'll make sure that part of my design includes an NURCE type topoff system to keep the levels right on.
On a diffrent note, I was just in the cities last weekend, do you ever let hobbiest have a look at your tanks? I'd love to see them and just chat about your experience some Saturday in the future, if your so inclined of course.
Thanks for your input,
Brent