Half my Comet fry have fantails?

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Have this 10 gallon aquarium set up with 100 plus comet fry. It appears a large amount of the fry have fantails and the others have single tails. I know they are still tiny and this is my first comet rear but i can clearly see a difference. At the time of spawning all the fish in my pond were all single tail red, white and brown comets. Will these babies keep their fantail? Is this common? Will the fantails develop more into egg-shaped or not?

Two single tails


left fantail, right single


The tank
 
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Single tail fish can combine to create double tail offspring. I imagine there are double tails in the family tree. I have seen it from the two yellow tamasaba goldfish I just purchased. So is it common? I dont know. Does it happen? Absolutely. Will the tail fuse together? Not likely.
 
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Single tail fish can combine to create double tail offspring. I imagine there are double tails in the family tree. I have seen it from the two yellow tamasaba goldfish I just purchased. So is it common? I dont know. Does it happen? Absolutely. Will the tail fuse together? Not likely.
I guess that will just make it all the more fun seeing what they change into. But if some have fantails and egg shaped bodies i dont think they would do well in my pond.
 
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You may be surprised. I kept an Oranda in my pond under the ice last Winter. Im in Michigan and it was a long hard Winter. It did fine although it sure is a slow grower.
 
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that's so cool! I'm trying to breed my wakin/watonai at the moment so I'm super jealous you got those babies without any effort!! :)
 

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How neat for that to happen. You will have some cool looking fish and I've heard also that those roundy fat fishies can survive the cold pretty good for some members here.
 
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