what kind of catfish is this?

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It's one of the marbled cats, either Perrunichthys perruno or Leiarus marmoratus. I'm leaning towards the perruno.
 
I agree with Perruno. Also known as Achara cat. I could be wrong. I have 2"ers available right now for $10, but that is fairly cheap IMO. I have seen them at that size, at PetCo, for 29.99..
 
I am going to say perruno also, although it will be easier to tell when it is older, and much, much larger, like, 2' 6" larger.
 
Deffinitely perruno, dorsal spines not enough to be marmoratus or longibarbis,usually 8 for former ,11 for latter.
 
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