Originally Posted by RXTrev
But anyway, a cheap way to go about it is to use a horse trough heater and using some submersible pumps to make the water circulate, but you don't want to cause surface agitation in the winter from what I've been told, could be wrong though.
Not quite right, but close. What you need is a hole in the ice (I'm from MD, really dunnow how frozen a MA pond would get). The hole in the ice allows for gas exchange, bad gasses out, O2 in. You don't want to disturb the lower layers of water. This is because of geothermal heat. As long as the pond is deeper than the frost line, there is a layer of warmer water at the bottom, heated by the Earth's natural heat. the top of the pond is actually much colder. Your fish, for the most part, stay down in the warm zone, and survive much better. If you circulate the water it destroys the warm layer and your fish end up much colder than they would otherwise, and will be far less likely to survive the winter. I use an electric de-icer, but must admit I've had problems with them being inconsistent, and the pond has frozen over for up to a month some winters, lost few fish though.
90 gallon, flourite, HP Co2, jobes sticks, Leaf Zone. 440 watts VHO lighting, home built canopy.