Fritz Maracyn Two Antibiotic Powder 20 pack.

Maracyn Two PowderA broad-spectrum antibiotic for aquariums, absorbed through the fishs skin to treat internal and systemic infections. Effective against gram-negative bacteria, with some activity against gram-positive and fungal infectionsmaking it an excellent first-choice treatment when the cause is unknown.
Treats: Fin & tail rot, popeye, septicemia, dropsy, internal infections, and secondary infections from injuries or parasites. Symptoms may include clamped fins, tissue damage, loss of appetite, or unusual behavior. Prompt treatment is recommended.
Active Ingredient: Minocycline