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It is a rummynose tetra. It is a shame that dealers feel the need to invent names. It causes confusion and shows they know little about their livestock. And it shows they do not care. Too bad our hobby is wrought with this. Bill
More particularly... I think it's a false Rummy Nose (Hemigrammus bleheri). Doesn't really matter as Bill said they do much better in groups and the three species that are commonly referred to as Rummy Nose will school together.
The top picture shows a black neon tetra.
The middle picture shows a possible glo-fish flanked by a gold white cloud mountain fish.
The bottom picture shows some healthy gold white cloud mountain fish.
Originally the pristellas were called x-ray tetras. There is a gold variety which yours looks like, but there are no differences between that and the regular ones. Other than a lack of pigment in the body. Same fish.