The genuine "Jelly Bean Tetra", (Ladigesia roloffi), is a hardy adaptable fish, but one which stresses easily. They don't need a species tank, but shouldn't be kept with very active fish. They are renowned jumpers, so a well fitting hood is in order.
There are several other fish that are sold as "Jelly Beans", a few are genuine small characins, but a number of painted/dyed fish have also acquired this label.