I agree with @thuctoanvietnamese. They have lots of names, maybe strawberry tetra or blueberry tetra and are a dyed version of the Albino widow tetra (white skirt tetra/black skirt tetra/black widow tetra). Dying fish is a harmful practice - if you only have these two I suggest you get the albino widow tetra to make up a shoal of 6 or 8 so that the dyed fish trade is not supported. A shoal should make them less shy.