Tetra Holiday Menu provides your fish with a varied and reliable food supply while you are on holiday and lasts for up to 14 days depending on the size of your aquarium and the number of fish. Thanks to Tetras gel food technology this holiday food is produced on a gel basis rather than as a gypsum block. The main advantage of this is that the food does not negatively affect the water quality in the long term and therefore the water values remain stable. The gel food block with Tetras BioActive formula is 100% edible and contains protein-rich pellets as well as delicious daphnia and krill. It also contains all the essential vitamins trace elements and minerals that fish need to stay healthy. The aquarium fish can nibble at the block as needed because it does not dissolve by itself.