The little powerheads are working better than the air-stones did by keeping
a larger hole in the ice. They're facing the surface of the water so as not
to disturb the bottom layers. These were mail order and less than $15 each.
:-) Other than make sure they don't clog there's nothing more to do until
spring.
--

Koi-Lo.... frugal ponding since 1995...
My Pond & Aquarium Pages:
http://bellsouthpwp.net/s/h/shastadaisy
~~~ }((((o ~~~ }{{{{o ~~~ }(((((o