60 Calcium Hearts, Blocks For Aquarium Snails, Shrimp, Food, Supplements. One Heart in your aquarium should last 3-7 days depending on how many shrimp and snails there are. Calcium is essential for the health and growth of your shrimp and snails. While shrimp, crabs, and snails don’t have bones, they do have a strong outer shell (exoskeleton) made of calcium carbonate. Snails build their protective shell by converting calcium into the beautiful, sturdy calcium carbonate shell. This also helps shrimps when they molt. Without adequate calcium, these invertebrates struggle to stay healthy and can cause death. One cube in your aquarium should last 3 - 7 days depending on how many shrimp and snail are in the aquarium. Store in a cool dry place.
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