Soil Heating Cables
I was checking out the local hydroponics stores in my area today, trying in
vain to find a trace element mix w/o nitrogen or phosphate. No luck. Anyway,
in one store I ran across "soil heating cables", designed for use in
propogation trays, I guess. The wires were plastic coated and looked to me
exactly like the Dupla ones. There was no control dial attached to it, the
package said it had a built-in thermostat that turns in on when the temp
drops below 74 degrees. The guy at the store said it was waterproof. The 48'
length sells for $24.99. They have various lengths ranging from 6'-48'. I
guess unless your tank was in a cool area, the cables wouldn't turn on, but
maybe with some fiddling by the electrically inclined, you could get around
the thermostat or something. Anyone tried these?