Quik post, I'm almost done digging my 12x7x3ft deep pond. It has to be cold water. The filtration system is more than adequate, and removes all waste from the pond,with perfect water quality. The pond is 1850gal. I can only keep cold water. Right now I am leaning towards a musky, pike, or alligator gar. I want to get a couple catfish ideas. It will not ice over during winter due to a bubbler and water fall. I'm in central indiana so it can get pretty cold, with the air temp at 0 degrees on the cold nights in the middle of winter, any recommendations?