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Deformity or different species - Goldfish

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So I recently bought two cheap fantail goldfish for my 75g that was sitting empty. They both had interesting colors that I hadn’t seen on a fantail before so I pulled the trigger. 
The dark one I am confident is a fantail— since he looks just like my OG goldfish in my other tank.

The white one is who I’m doubting. I thought his tail fin was just clamped up in the store and figured it was just stress but its been a couple weeks and the closer I’m looking the closer it looks like a single tail fin. Really odd since he was in a tank w/ all the other fantails and his body shape looks like a fantail to me too. He swims fine but does swim SLIGHTLY “crooked”.


What is this imposter?




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