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Heating cables

I'm confused about this whole heating cable thing.  Perhaps this is partly
just a conflict of approaches between differing schools of thought.  I read
on this list that UGFs are bad because they cause a current across the roots,
which reduces something, maybe it was the develpment of root hairs.  But
others are fighting with heater cables in the hopes of generating current
flow through the substrate.

And why cables?  There are heaters designed to fit to the underside of the
tank.  This seems a lot easier to me.  They should be just as efficient t
generating convection in the substrate.

Bob Dixon