How fast do feeder fish (Comet goldfish) grow?

Tavin

New member
I know they can get pretty big but I've had mine for about 3 months and it still seems to be the same size as when I got it. Do I have to wait a little longer to to see some changes or do I have a midget fish? Btw it's in a 10-15 gallon tank.
I feed it goldfish flakes and sometimes frozen bloodworms.
 
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