How much penicillin should be added to 100 liters of water in a fish tank mainly depends on whether it is used for treatment or sterilization. If you are treating fish diseases, you can put one 800,000-unit penicillin in a fish tank with 100 liters of water. And change the water every 2-3 days, and then observe the specific condition of the fish. If it is sterilization and disinfection, half a vial of penicillin, which is 400,000 units, can be placed in a fish tank with 100 liters of water.

Tip:

Penicillin is a highly effective, low-toxic antibiotic. Although they can sterilize and treat diseases, they can also damage the nitrification system in the fish tank and kill some bacteria in the fish tank that are beneficial to the fish.