When a fish in an aquarium is sick, it can potentially infect the other aquatic inhabitants. This is why aquarium keepers need to understand how to diagnose and treat fish diseases. The sick fish will exhibit symptoms of the sickness. Therefore, by identifying the symptoms and disease accurately, you can treat the sick fish early with the right medication and prevent the spread of pathogens in your aquarium. Seachem has a complete range of aquarium medications to treat almost all known fish diseases. Refer to our Seachem guide for details.