Is a special formulation for all carp fish Daily Use Formulary which spirulina 3 percent suitable for carp fish to help your carp maintain bright coloration. Ergo Design elliptical shape conforms to the fish's mouth shape and oesophagus making it very easy to capture and swallow. Decrease head and bone deformities and prevent plump fish conformation by reducing fat deposition5. Complete nutrition and Vitamins Non - Water fouling.