What Kind Of Tetra Is This!? Help!

[JSkeleton]

I bought a school of Diamond Tetras, which were mixed with I believe 2 other Tetras. I think they may have accidentally gave me a different kind, but I'm looking to confirm. I've attached pictures of the fish. He/she seems to be swimming alone mostly, while the others are schooling. What kind of Tetra is this one?? Thanks!

 

[betta fish]

I'm thinking silver tip tetra, though it doesn't have a lot of colouration at the moment.

 

[cowgirluntamed]

It's definitely not a diamond, it's the wrong shape. No matter what it is I'd see if you can catch it and take it back, tell them they gave you the wrong fish!

 

[DoubleDutch]

Female Silvertip

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