The sea monkey eggs are a dry powder because of cryptobiosis, a state of suspended animation that occurs naturally in Sea-Monkeys in order to help them survive until ideal conditions appear. Kit contains a PMS plastic tank, food packet, water purifier and sea monkey eggs. The tank needs to be filled with water to fill line. Purifier packet must be added to the water to clean it for the sea monkeys. Open and empty the Sea Monkey egg packet into the water. A classic set to create your very own adorable Aqua-Pets. Each plastic aquarium is equipped with a ventilated lid, built in magnifiers, and molded seascape bottom. This tank measures 5.625" tall.