Now there are two more sera granulated foods that, due to their composition, optimally provide for the specific requirements of the yellow/red and green/blue discus. sera discus color Blue and sera discus color Red now complete the sera family of discus granulates. They sink slowly, meeting the eating habits of the magnificent discus. Both foods are blended from more than 40 ingredients - each tailor-made to suit the specific discus color variant - for the most intensive color formation.