I'm pretty sure those are Silver tetras but I could be wrong. They don't really have a tetra shape but the hump could be something they develop later..
How are your other fish responding to them? Are they working well with the tank? I feel bas for fish to be moved again. Will you take them to your LFS if they dont work out? Petco takes them on our area.
The new fish are working out fine. Definitely a fair amount of movement in the tank now. Between the new fish, the giant danios, and the buenos aires tetras it is like a mad house. They all seem to be getting along with the severum and chocolate cichlid. My son took some video from inside the tank with his gopro but it is 30 minutes long. If he ever gets around to editing it I will post a link. It was funny because my BGK must sense the electricity. It kept bumping the camera trying to see what it was.
If he doesn't get to editing I will post my own video.
I worry a little about the fish load but I think between the 125 gallon tank the the 45 gallon sump I should be fine with regular maintenance. If it becomes an issue I will Craigslist the danios.