From what I understand it is very slow growing and hardly needs any light, so although it will feed on some of the nitrates, it is not going to do anything on a test kit chart for water condition. If you get one it will be more for the decoration aspect than what it will do for your water quality, Your fish might like it, but not really any more than the fake plants you can get. The other thing to consider when you add any type of real plant life into your tank is the possible risk of parasites etc.