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Give it time, goldfish grow very slowly. It may take up to 3 years for a goldfish to reach adult size. Your fantails probably have grown, it's just been so subtle that you haven't noticed. Another way you could get them to grow quicker is to, instead of feeding them once or twice a day, feed them three times a day. Small goldfish's abdomens can't hold as much food at a single time as say a larger goldfish, so feeding them plenty of small meals throughout the day, will ensure they are getting plenty of nutrition.

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โˆ™ 2009-10-25 21:43:41
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Q: You put your 2 fantailed goldfish in a 50 gallon tank and expected them to grow rapidly However it has been over a month and they have not grown much How long will it take them to grow into their tank?
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