API E.M. Erythromycin PowderAPI E. M. Erythromycin Powder treats a broad range of bacterial fish infections including hemorrhagic septicemia, fin and tail rot, mouth fungus (cotton mouth), open red sores and bacterial gill disease in freshwater and saltwater aquariums. Powdered fish health remedies allow easy dosing for easier, faster, and more effective treatment. Broad spectrum antibacterial fish treatment Allows treatment and control of bacterial fish infections Treats fin