Brandonsdad, I have waterfall on one end of koi pond, skimmer on the other, bog feeds from the skimmer, and overflows back into the pond in about the middle on that side. In the goldfish pond, skimmer is in the middle, stream is on one end (fed by the skimmer) and pump in the middle of the pond feeds the bog, which overflows into the pond on the far end from the stream. So, each pond has movement on each end and somewhat in the middle. I have a bubbler ready to plug in a go on the end near the waterfall in the koi pond, and water pump to push water to the surface for movement to keep ice at bay in the goldfish pond, to the side of the middle near the skimmer. Both are ready to go, just have to plug them in. I would really like to leave everything going, and am going to do just that unless and until I find that it just is not going to work for whatever reason. I think Colleen has it all figured out, and my winter is sure not nearly as cold as hers. I do have a floating heater to use just in case things get out of hand, and I had to melt an area to say pull a pump from the skimmer or something like that. Otherwise, the plan is to not use the heater at all, as I'm sure it used far more electricity than either the air pump or the water pumps.