I don’t think it would be a good idea to get another goldfish. Most people would say that the minimum tank size for a goldfish is 30 gallons. Maybe a school of other fish would be better. Neon Tetras or GloFish (Danio or tetra) would look great in there. You could keep about 15ish neons and maybe about 12ish GloFish.
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Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.
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