Aquarium Products' Gel-Tek Ampicillin is a broad spectrum bacteriostatic antibiotic that exerts anti-bacteria action on susceptible organisms. It is effect against a number of Gram-positive and Gram-negative bacteria associated with fish diseases. Use for bacterial infections pop eye, swollen body, bacterial kidney disease, fin rot, Flexibacter infections and septicemia. Safe for plants, reef tanks, and biological filters. Use 5 drops per fish twice a day. Repeat for 3 days. Bottle contains 2 fluid ounces.