IDEAL LIVE FOOD: Creates the ideal place for copepods to grow and breed providing a supply of live food for finicky feeders. EASY TO USE: Simply place in your sump or refugium. The copepods will naturally hide in the hotel, especially if a light is placed in the sump. As desired, move the pod hotel to the display tank and shake to release the pods! UPGRADED: This is V3 of our copepod hotel that more readily sinks, contains 50% more room for copepods, and is of a higher print quality. SAFE: These copepod hotels are 3D printed with light-weight and strong reef safe PLA - many colors available. VERSATILE SIZE: Measurements are approximately 3" x 3" x 3". Ideal for sumps and refugiums.