Is this normal?
As an experiment, I wanted to see how long my 10g could go without a water change. Usually I do a weekly water change, but it's been three weeks since I've done one. I tested the water and have <20ppm of nitrates. The tank is well planted and fill with nitrate suckers (floaters, wisteria, etc...)...is it normal for me to only have to do a water change ~monthly in these conditions?