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Re: heating cable sources

Arizona Aquatics carries a different kind of substrate heating system 
that appears plausible. It uses a powerhead to push conventionally 
warmed tank water through tubing that runs under the substrate. See 
their substrate page. Does anyone have experience with it?

John Caddy
Self Expressing Earth (SEE)

John Caddy
Self Expressing Earth (SEE) <http://cgee.hamline.edu/see>
Center for Global Environmental Education
Hamline University