JBL ProNovo Fex are freeze-dried Tubifex as a treat for all ornamental fish from 8-20 cm. Tubifex are part of the natural diet of many ornamental fish that search the ground for food. The 15-85 mm long Tubifex live in the soil and the blood pigment haemoglobin results in their red colour as long as they live. During the freeze-drying process, the red colour disappears. Unlike live and frozen food, there is no danger of introducing diseases or unwanted bacteria into the aquarium. The JBL ProNovo Fex chunks float on the water surface because of their buoyancy. The fish can bite off smaller chunks there. Alternatively, the chunks can be pressed slightly in the water so that their buoyancy is reduced.JBL ProNovo Fex+ freeze-dried Tubifex as an ideal food supplement/treat for all freshwater fish, crabs, crayfish, shrimps and axolotol+ Tubifex are very energy-rich and strengthen the organism of the fish+ alternative to live and frozen food: supplementary nutrition for tropical freshwater fis