Rose Quartz Koi

This Tiny crystalline sculpture of a fish weighs 2 pounds and looks miraculously lifelike. When you place or release the sculpture at a point underwater, it comes to life and swims around in a 5-foot-cube centered on that point. If placed in a container of salt water that's no larger than 5 feet on a side, the water inside becomes fresh after 10 minutes. You can use an Action to recapture the swimming sculpture.