Provide your aquarium fish with a food store for up to 14 days. Use: add food block to the aquarium. It sinks to the bottom and provides food for about 20 - 25 ornamental fish up to 3 – 20 cm in size for up to 14 days. The block consists of a calcium compound that adds some General hardness to the water when dissolved. It dissolves slowly as the fish intake the food. Natural raw ingredients without artificial additives for a natural diet and healthy aquarium fish. Tested on JBL research expeditions in the tropics. Package contents: 1 food block for feeding.