TXBobcat said:I put 6 goldfish in a 360 gallon concrete water tank. It has an automatic waterer on it. The have been in there over a year, and the tank even froze pretty solid a couple of times. I never fee them, and they seem to be doing fine.
I also put 3 goldfish in a smaller stainless steel tank with an automatic waterer. All three of them died within a few months. Don't know if the tank was too small (probably 100 gal) or it has something to do with the stainless steel tank.