I know they are tetras but what kind?
To me they look like a skirt tetra
Not even close. Those are Candy Cane Tetras, they are a population of Hyphessobrycon bentosi.
Yay, thank you! Now I know what these guys are. Very lively fish.
The only reason I didn't go with candy cane is because I have never seen a candy cane with a squared off dorsal fin like that. ((oh and they are still called Candy Cane, at least everywhere I've looked)) Yes coloration does point to a Candy Cane.