JBL ProNovo Spirulina Grano S are spirulina green food granules in size S for all aquarium fish & shrimps from 3-10 cm length. Spirulina are blue-green algae, of which some species, such as the S. platensis processed here, have ideal protein contents for feeding ornamental fish. By the way, the spirulina content of 20 % in JBL ProNovo Spirulina Grano S is perfect - more would not be healthy for the fish! The natural astaxanthin (a carotene) in the algae causes the beautiful colouring of the fish. This is another reason why spirulina algae are very popular for feeding ornamental fish.JBL ProNovo Spirulina Grano S+ sinking, prebiotic spirulina algae food granulates for herbivorous (plant/algae-eating) aquarium fish such as livebearers and sucking shrimps+ natural raw ingredients without artificial additives for a natural diet and healthy aquarium fish+ tested on JBL research expeditions in the tropics+ very high acceptance even in choosy fish species thanks to high-quality raw ingredient