The old 55 is torn down and sitting on the deck. The new 90 is sitting totally empty on its stand. I've read "Do-It-Yourself Substrate Heating Cables" on the Krib. Has anyone built one of these systems for a 90 gallon tank? I've got a list of the components I think I need but I'd sure like to compare that to a working system. I'd especially like to know how the water-proof connection was made.