OTC Fish Doxycycline 

• Is a broad-spectrum antibiotic and stops the growth of bacteria
  
• Controls Septicemia, Mouth Rot & Fin/Tail rot 
• As well as; Infected Eyes, Pop-eye & Skin Ulcerations
• Doxycycline exerts a bactericidal action on gram positive bacteria
• Intended for aquarium and ornamental fish only.