What is this fish?

[SWotherspoon]

I recently picked up some Kuhli Loaches from a local aquarium store and when I put them into my tank, I noticed a little mystery fish (see pictures) in the bag also. The guy who picked the loaches struggled as they move so quickly and are very small so I don’t think any of us noticed the extra fish at all. I thought it would be fine to keep them together since the aquarium did, but I want to double check and potentially get more if that is what this fish needs - I don’t want it to be alone! I do also have guppies and tetras in the same tank and he seems to spend a lot of time with the tetras. Does anyone have any ideas and / or tips?

 

[rlederer]

It's a tetra for sure but I'm not sure of what species. Probably genus Hyphessobrycon

 

[Arthur75]

Hyphessobrycon pulchrippinnis, Lemon tetra