Just a head's up...

Rich now carries the Ultratherm heat pad, which is a great alternative to flexwatt if you only have one or two tanks to heat. It's made similar to the flexwatt and has a low voltage to keep it from getting too hot like most pads. Also it's sealed in, laminated you might say, to better protect from moisture. After a good talk with him, he recommended the pad to me. Prices aren't bad either.