WATER CONDITIONER: Aquarium Water Treatments Kit (16 Fl Oz total): Methylene Blue / Water Conditioner / pH Down / pH Up

Methylene blue is a common medication used in the aquarium hobby to treat various fish diseases, such as fungal infections, bacterial infections, and parasitic infections. It is also used as a general disinfectant for aquarium equipment and to prevent the growth of fungus on fish eggs.