You have too much time on your hands. ;-) How about inventing some kind of
heater for betta bowls to sit on and be heated? You know, like a heat tape
that runs along the window sill, table or shelf with the bowls sitting on
them. I'll be your first customer.

Take a 500 - 1500W space heater. Put a glass table over it. Put the
jars on there. Adjust the heater between 500 1000 and 1500W as
the season changes or get a thermostatically controlled one. That'll
heat a small room, too.

We do this with a lizard to keep it at the right temperature. I
must have arctic bettas because they don't mind the cold, the lizard
does though.

That'd probably work for a lot of jars. If you jsut had a few
I'd probably try to make something out of xmas lights, incandescent
ones. One per jar should be enough, jsut make a small base for each
and stuff the bulb inside it. Shim it with rock slices to regulate
the temperature if it's too warm.


--
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