Probiotic Marine Formula 16 oz

This disease preventive contains billions of "protector" bacteria that stop the activity of pathogens so they don't come back in 2nd or 3rd stages, killing your fish. Effective against Ich, closed fins, velvet, body fungus, hole-in-the-head, and vibrio, without chemicals or pesticides. Completely safe for all fish, corals, and aquatic plants. Add 2 teaspoons per 20 gallons first dose, then 1 teaspoon per 20 gallons every 2 weeks. 16 oz. treats 100 gallons for 33 weeks.