The Jellybean Tetra, the other candidate for the common name "Jellybean fish". Unless that name more properly applies to Lepidarchus adonis, the FishBase species entry that came up next in google when I searched for "Jellybean Tetra". Both species have Paugy (1990) listed as their primary reference, but that paper is in French so I'm not going to try to read it and figure out if it represents the initial species description for either or both of these fishes. Both are apparently native to tropical West Africa. Here's a picture of Lepidarchus adonis, just for completeness' sake.
This is getting more confusing, not less. I may have to abandon such silliness, unless someone can enlighten me about common names of semi-obscure aquarium-hobby fishes.
Photo credit 1 and 2.
Paugy, D., 1990. Characidae. p. 195-236. In C. Lévêque, D. Paugy and G.G. Teugels (eds.) Faune des poissons d'eaux douces et saumâtres de l'Afrique de l'Ouest. Tome I. Coll. Faune Tropicale n° XXVIII. Musée Royal de l'Afrique Centrale, Tervuren et O.R.S.T.O.M., Paris, 384 p.