well are family has had gold fish for a long time, Ok this is how the tank has been for the last 6 years, its a 5gal all 4 gold fish about 5-6" big. now i hear people say that they are messey fish, i dont think so. we only do 100% water changes once a week if luck on this tank. and its always clear, but its amazing that the fish have lived that long in the tank. the always seem so happey and are always wanting food.... i know the tank is over stocked and my mom does not want 2 change it so i just let it be. i cant have gold fish in my tanks Because they could swallow some of my fish hole... so i guess there gonna stay that way. Dont you guys think that they are amazing to have lived for over 6 years in a tank of that size?