Put shell inside a container filled with enough water to cover it. The water temperature must be less than 35C (95F) The shell will slowly break after 24-48 hours, your mermaid will emerge. Be sure to keep the container. full of water. After the shell is broken entirely, add fresh water to the container. Your mermaid will continue to expand for 48-72 hours. After 72 hours, you may like to move your mermaid to a large container with fresh water. Watch yopur mermaid continue to grow more! Funny, amusing, MAGIC, novel! For ages 5 and up.