Tetra Medica Lifeguard is a broad-spectrum treatment for external bacterial fungal viral and parasitic disease in the freshwater aquarium. Convenient all-in-one treatment for tropical freshwater aquarium fish effective therapeutic treatment for a wide variety aquarium fish diseases with pre-measured tablets are extremely effective against fungus and ich disease Use not for scaleless fish invertebrates or newly setup aquariums. Use only as directed and do not overdose. Add one tablet per day to each 30 l of aquarium water. Treat for 5 consecutive days at 24 hour intervals. For best results after day 5 treatment wait another 24 hours (day 6) before returning activated carbon and turning on UV sterilizer. Also on day 6 make a 25% water change using a tap water conditioner/dechlorinator.