Ted wrote:
I live in zone 9b, and my water temp in the winter only gets into the low
50's. Is it necessary at that temp to turn my waterfall off? I have a
bottom drain where my external pump sucks the water from.

Thanks,
Lisa

Just my opinion, I would leave the waterfall going. Freezing should not
be a problem for you and the extra oxygen created should be beneficial
to the fish.

deanna