Make Cupcakes Per Box Cake Mix Directions.
Spoon into lined cupcake pan. Bake until a toothpick comes out clean.
Cool cupcakes completely before decorating.
Break marshmallow fondant into ¼ and ¾ portions. Work 15-20 drops of yellow GEL food coloring into larger portion of marshmallow fondant. Break yellow marshmallow fondant into 12 small pieces.
Form each of the 12 pieces into a ball, then roll it into a fat cylinder. Make one end of your cylinder very thin and the other very fat. This is your fish body.
With the remainder ¼ of the marshmallow fondant, work in 5-10 drops of blue food coloring. Break off a very small portion, roll into a ball and flatten it.
Make 3 more identical flattened balls. These are the side fins and tail fins.
Place side and tail fins on fish body in the appropriate locations.