A saltwater aquarium requires a bit more maintenance than other aquariums. While both saltwater and freshwater aquariums require monitoring temperature and water quality, saltwater aquariums have a few other factors to watch out for, such as salinity. Saltwater fish can also be very sensitive to even mild changes in water temperature, pH levels, and chemical levels in the water. Like any aquarium, it’s important to understand the needs of saltwater fish and how to support them.