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Re: Ballast Heat

Erik Leung wrote about placing ballasts under the tank to create convection
currents.  It's my understanding that the convection currents created by the
heating cables are dependent on a water temperature differential across a very
small area.  The heat from the ballasts are radiant heat that will tend to
create a relatively uniform warmth across the bottom of the tank.  How will
this create convection currents?