I've had a pond now for over 12 years. I love my pond!!! I've had koi and goldfish and have had to restock a few times because of blue herons. I'd start with just a few fish (5-10) and in a few years I'd have 30-50. Have a waterfall that feeds into a pond around 2,500 gal. I live outside of Denver Co. and have successfully kept 99% of my fish alive through the winter. Last October my pond started losing water. I've had small leaks before but always found and repaired them. I was very upset because winter was coming I couldn't find a leak. My pond liner is EDPM. So long story short, I've lost all my fish. I couldn't keep up with the leak. My fish are probably all dead under the ice. \nSo now I'm going to completely start over. Not an easy task. My main reason for joining is to get advice on doing things right. I know I made a lot of mistakes when I first built the pond. Things I've had to try to fix to keep my pond alive. Sorry for the long story. Looking forward to getting to know some of you and maybe help along the way.