Deformity or different species - Goldfish

[EVoyager31]

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?

[Ninjoma]

I just want to note that all goldfish are the same species. There are just different breeds, like dogs or cats.

[EVoyager31]

On 8/25/2023 at 1:30 PM, Ninjoma said:

I just want to note that all goldfish are the same species. There are just different breeds, like dogs or cats.

Lol you're so right! Brain fart 🧠