Tetra Natura Bloodworm Mix –Bloodworm and Krill with added nutrients Produced using Tetra’s exclusive gel technology, Natura is a patented formula that combines natural foods and very fine feeding granules within a 100% edible soft gel. This creates a food with a soft, highly attractive texture and taste that fish love. Whilst the use of natural foods and edible gel increases the fishes’ enjoyment of the food, the fine granules ensure they also receive the right balance of nutrients for a complete, healthy diet. Tetra Natura is therefore perfect for people that want to give their fish a tasty, more nature-like daily diet.