Hi, I have one fancy goldfish (a fantail) in a 10 gallon tank, he's only about 3 inches long... he seems happy enough on his own and my tank isn't big enough for a second goldfish, i don't think, but I'm just wondering if there are other fish he could share the tank with or if it's even necessary to add more fish? I didn't think goldfish necessarily needed tank mates but lots of people have disagreed with me so I just want to make sure. Is he fine on his own or should I get him a friend?
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