Nutrafin Basix fish food blocks. Choice of 3 and 7 days.

The Nutrafin basix Food Block is specially designed to provide food and vitamins to your aquarium fish for 3 or 7 days depending on the format. This time-release block provides enough pelleted food and vitamin supplements to meet the needs of a 37.8 L (10 US gal) community aquarium. If it is a larger aquarium, add one block for each additional 37.8 L (10 US gal).