Color Enhancer: Astaxanthin makes red redder and Vitamin C makes white whiter. Bringing out the vivid natural colours of your fish. Medicarp Color Enhancer is formulated with the optimum quantity of Astaxanthin. High Digestibility: Medicarp Color Enhancer is made from the highest quality ingredients, all easily digestible by your fish. This is good for the health of your fish and makes sure that no food is wasted. Stress is the main cause of some diseases in Koi. Medicarp is enriched with Vitamin C which reduces stress in your fish and protects them from pathogens. Medicarp keeps its shape in the water for longer, leaving less debris and dust in your water.