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Place a block in your aquarium. It will dissolve slowly and release food particles.
It is recommended to change about 10% of aquarium water weekly.
Do not use the block in an aquarium without aerating or filtering equipment.
Water should circulate well for the block to dissolve properly.
One block will be sufficient for 10 to 15 average size fish in a 45 liter aquarium for approx 3 day.
