• I would replace at least 1/4 of the water in the tank and clean the gravel. Use a good chlorinator like stress coat or something similar in the water. Watch for ick (white spots over the body), if they get that you'll need to do weekly water changes and treat with a ick med. Make sure the temp hasn't dropped to low, goldfish usually will survive in cooler temps, although usually don't swim around alot.

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