Thomas Labs Fish Pen Forte (Penicillin) Antibacterial Fish Antibiotic Medication, 100 Count (500 mg. ea.)

Fish Pen Forte works to control all gram-positive and many gram-negative bacteria that can plague your fishy friends?diseases such as fin and tail rot and Flexibacter infections are all easily controlled and cured with Fish Pen Forte. Plus, Fish Pen Forte is versatile enough to work on both tropical and freshwater tanks?perfect for multi-tank homes!

Easily dissolves in water and can be used for up to 10 days.