Description Nutrafin Basix 3-Day Fish Feeder is specifically formulated to provide aquarium fish with nutritious food and multi-vitamins for up to 3 days. The slow-release blocks contain a rich diet complete with multi-vitamins for community aquariums up to 37.8 litres For larger aquariums, simply add one block per 37.8 litres Features: Specially formulated to provide food and vitamins to the aquarium for 3 days. Slow release feeder block. Varied diet of pellets and multi-vitamins. Slow dissolve block provides a time-released source of food. For all small to medium sized tropical fish.