SunGrow Shrimp Rocks for Aquarium, 4-oz. Calcium Stones for Freshwater Aquarium Calcium Rocks for Snails, Recreate Shrimp Habitat, Feeder Discs for Crabs & Crayfish, Snail Tank AccessoriesFor overall development Are your shrimps losing color? Do they not look as vibrant as before? Here is your solution SunGrow Rocks. Our rocks provide the perfect balance for vitality, color and growth, especially for baby shrimps in growing age. They are rich in calcium that helps shrimp with building stronger shells, and full of magnesium that is essential for all crustaceans to maintain vibrancy. This product can only be harvested and not made.