This compatibility chart is a valuable resource for freshwater fish keepers to ensure a harmonious and thriving aquarium. Selecting the wrong tank mates can lead to stress, aggression, disease, and even death. Common compatibility issues include territorial fish, aggressive species, fast swimmers versus slow swimmers, and predators versus prey. By carefully researching and considering these factors, such as size, temperament, water parameters, and dietary needs, before adding new fish, you can create a balanced and peaceful underwater ecosystem where all inhabitants can thrive. Remember to research individual species thoroughly, as even within a compatible group, there can be variations in temperament.