What is the difference of filters in freshwater and saltwater aquariums?

Yes, we use the same filter in both freshwater aquaria and saltwater aquaria. You are probably wondering why. Well, the bacteria in a saltwater aquarium system are different from the bacteria in a freshwater aquarium. The filter works just fine for both. There are other differences between a saltwater aquarium and a freshwater aquarium. A freshwater aquarium is different from a saltwater aquarium because there are different fish in each. So what kind of fish? Some fish that you don't see in a freshwater aquarium but you may see in a saltwater aquarium are clownfish, damsels, and tangs. These are fish that are a little more difficult to take care of because they need a specific temperature and a specific level of salt in the water. Take care of the fish and you will be rewarded.