Step 1
Make the gelatin according to package directions using all white grape gelatin plus 2 tablespoons blueberry gelatin. (Parents will want to do this part.)
Step 2
Pour the gelatin into the glass bowl (or use several small glass bowls) and refrigerate until the gelatin is partially set, but not solid.
Step 3
Show kids how to use a pair of chopsticks to submerge the candy fish into the gelatin. Return the bowl to the fridge until fully set.