Sandman, clearing snow off the pond to let in sunlight can be a difficult and sometimes dangerous task, as Cecil has suggested using a submersible pump to run water on top of the snow and ice works well to allow more light into the pond, I've used this technique every winter before the snow gets too deep.
It really helps in addition to aeration.

Last edited by adirondack pond; 12/06/12 08:52 AM.