Crystal Mermaid Terrarium

First grow the crystal coral, then build an underwater mermaid world around it. This hands-on terrarium kit combines a simple science experiment with sand, shells, buried treasure, stickers, and whimsical sea friends for a project that keeps changing after the decorating is done. Crystals can begin forming in about 24 hours, and the finished terrarium glows with a light-up lid and glow-in-the-dark details. Hot water and adult help are needed for the crystal step; two AAA batteries are also required and are not included. Ages 6+.

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