Originally Posted by ChoclateBetta
Wait so I don't need 50 percent for my heavily planted filtered ten gallon?
Possibly not, google walstad planted aquarium and see if yours is close to that. Usually, they have dirt, gravel on top and tons and tons of plants. A true Walstad aquarium, depending on size can go months to a year without needing a water change. (My cousin has a 55 gallon one and does a 25% water change once a year - just to be on the safe side - I don't have a picture of it as he lives in another state)