Hi All,
I am a new member looking for advice. I have a 20 gallon high tank with 3 goldfish in it for over 2 months now. A 3 inch comet, a 2 and a half inch calico fantail and a 2 inch orange and white fantail. Not including tail. How long can I keep these fish together before I will have to upgrade? Is the tank overcrowded? They look very healthy and are a lot of fun to watch.