Fritz Maracyn Two Powder can be used to treat a broad range of gram negative pathogenic bacterial fish infections. This anti-bacterial medication can be used to treat fin & tail rot, gill disease, dropsy, popeye, septicemia, and other gram negative bacterial infections. 
 
Active ingredient 10mg of Minocyline per pack 
For freshwater and saltwater aquariums 
Safe for invertebrates when used as directed