Tetra Holiday - healthy holiday food for all ornamental fish.  Patented* feeding block ensures the best provision for your fish for up to 14 days. Essential vitamins, trace elements, minerals and tasty daphnia provide a healthy diet during your absence. The Tetra Holiday block is 100% edible. Long term solid in the water without polluting the water. Usage  Days: <7, Days of absence and aquarium size: <60l, Amount of fish: 5 - 15, Number of Blocks: 1/2 block Days: <7, Days of absence and aquarium size: 61 - 120l, Amount of fish: 10 - 30, Number of Blocks: 1 block Days: <7, Days of absence and aquarium size: 121 - 200l, Amount of fish: 20 - 50, Number of Blocks: 1-2 blocks Days: <14, Days of absence and aquarium size: <60l, Amount of fish: 5 - 15, Number of Blocks: 1 block Days: <14, Days of absence and aquarium size: 61 - 120l, Amount of fish: 10 - 30, Number of Blocks: 2 blocks Days: <14, Days of absence and aquarium size: 121 - 200l, Amount of fish: 20 - 50, Number of Blocks: 3 blocks Remove freshness seal and drop block out of the tray into the aquarium. Number of blocks depends on number and size of fish, days of absence and aquarium size. For feeding guide see chart. The number of fish indicated in the chart is based on the average fish size of 3-6 cm.