Line a baking sheet with parchment paper and set aside. 

Place turquoise candy melts into a microwave safe bowl. Place white candy melts into a small resealable plastic bag, but do not seal. Place the lavender candy melts in a separate resealable bag but do not seal. 

Place all items into the microwave, laying the bags of candy melts flat. Microwave at 50% power for 1 minute. Knead the bags of candy melts and stir the bowl of candy. Return to the microwave, in one minute increments at 50% power, stirring and kneading after each time in the microwave until smooth. 

Spread the turquoise candy melts onto the prepared parchment paper and spread to about 1/4" thick. Seal the bags of candy melts and carefully cut a small hole into the tip of the bag. Swirl and spiral the colors from the center outward. 

Using a knife, drag it into the candy to create a wave like effect. Sprinkle with sprinkles and mermaid tails. Let stand to harden, or refrigerate for 15 minutes until hard.

Once hard, use a sharp knife to score the candy and break it into pieces. Spray the candy with glitter spray. 

Serve immediately or store covered, at room temperature.