tarpon
Aquarium Advice Addict
I know goldfish are supposed to have a 20 gallon but i have mine in a 10 from back when i didnt know much about them and he hasnt outgrown it. Its just him and shrimp in the tank and ive had him for around 3 or 4 years and he seems to have stopped growing at around 3 inches. I know they can get baseball size. Mine is proportional and healthy from what i can tell. Why do you think he has stopped growing?