In addition to enhancing the aesthetics of a freshwater aquarium, aquatic mosses provide a number of other benefits. For example, aquatic mosses contribute to improved water quality by absorbing nitrates and other nutrients from the water column. While most aquatic plants requires high level of lightning and fertilizer to facilitate this process, aquatic mosses do not.
Like all live plants, aquatic mosses produce oxygen as a byproduct of photosynthesis which can help maintain ideal oxygen levels in your tank water. It is important to note that while aquatic mosses can improve the water quality in your tank, they should not be used as a substitute for regular water changes.