payara i.d.

I recently picked up this bold little guy from my LFS, and he's doing very well with my other fish - there's only one problem: I don't know if he'll grow out of my tank or not. I'm hoping he isn't an Armatus, and I'm hoping for the Scomb... Any help with the IDing of my new carnivorous friend...

I have a new payara that is starting to show his or her true color. Anyone wanna i.d it?