Fin Congestion is a common contagious disease of goldfish. Goldfish with long fin usually susceptible to this disease. If we see the red blotches that appear on the trailing edges of the fins, this is an indication of fin congestion disease. We will also see the hemorrhages, bright-red topical areas, not veins inside the fish. This disease make blood vessels inflammation at the ends of the tail. Fin Congestion starts at the edge of the fins and works its way toward the body, and in the end affect fin rot
