Expanding existing pond without removing fish
I have been reading posts on this site for quite sometime but have never written one. I have a garden pond with koi that I feel may be too small. It's approximately 900 gallons but I have about 12 koi. It's about 3 ft deep.
I've been inspired and encouraged by the posts from Cliff and Joann on how to do this. But they are a couple years old and I was wondering if anyone else has done this since those posts were written. I have read on other sites where people do not recommend doing this. I know a few people here have, but I guess I'm looking for a little more encouragement before I make up my mind.
I would do what Cliff and Joann did, only going about 2 ft in the new section. My question also is do the fish know to go to the deeper section during the winter months, as I live in upstate NY where winters can be below freezing for weeks/months at a time.
Any further advise on this subject would be great.