Hi, I used to keep fish many years ago so i know the basics. The one thing i did not try was having a smaller just planted tank that id use for the water that would then go into my main tank at water change stage (main tank also will be well planted). The other reason is that the water supply in my area now has pretty high nitrate concentration just under 40, so im thinking about a more sustainable natural way to bring this down. So the plan was to have a tank with fast growing plants add in a little plant food then take the water from that tank into the main periodically. The water from the main tank will just be dispossed of on my garden (as im not aware of a way to remove fish hormones, which is an important reason?). Is something like this realistically going to work or am I wasting my time? Main tank is about 180 to 200 litres and smaller tank 60 to 80 litres. Edit. Im in the process of a fishless cycle so have a little time to establish before hand. Thanks.