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These Smithsonian Magic Rocks are a fun way to teach principles of science to children. They come with a compact aquarium that you can use to hold goldfish or other small species. This Smithsonian rock kit allows kids to create their very own colorful crystals that grow up to 4" in height. They look attractive, especially when you place the included space background behind them. The crystals reach their full height in just two hours for fast results. Your kids can keep the aquarium up to enjoy as a decoration.