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The fantail goldfish is asserting it's dominance over the common goldfish. The fantail goldfish has already established in its mind that the whole tank is its territory and will fight any other fish that try to change that. This is normal when adding new fish to an established tank and they will usually continue to fight for a couple more days. During this time make sure to give the fish plenty of food to eat and some place for the common goldfish to hide. If they do not stop fighting after several days than I would recommend moving the common goldfish to its own separate tank of at least 20 gallons.

Another reason (though not as likely) is that the common goldfish is a female and the fantail is a male. A male may chase a females rear- this is normal but if he harrasses her- remove her immediately.

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Q: My fantail Goldfish has been alone in good size tank now for one year I put a common Goldfish into the tank just yesterday and the fantail seems to be 'bullying' the common Goldfish What is happening?
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What kind of goldfish should you get for your fantail goldfish?

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