Make fish toppers. Melt red, orange and yellow Candy Melts candy, separately, according to package directions as needed. Place fish cutter from set on non-stick cookie sheet. Fill cutter with melted red candy. Tap to smooth. Chill until firm, about 10 to 15 minutes. Unmold. Repeat to make one orange and one yellow fish.
Use melted candy in cut decorating bag to attach heart sprinkle lips and large or small candy eyeballs to fish. Chill until firm, about 3 to 5 minutes. Reserve remaining melted candy.