Hi. I have never posted anywhere before on anything but thought I must on this. I am a very new tropical fish keeper. I inherited them from my son. About two months ago my tank whet from clear to very very green. I tried everything except chemicals and was about to ditch it all in when I came across the willow method. My sons and everyone who saw what I was doing thought I was nuts. So I duly put the willow in the tank as instructed. After six days of not really seeing much change but with the white roots starting to show I very nearly took them out, but didn't as I was going away for the weekend. I returned two days later OMG the tank is very nearly crystal clear. I can see my fish again.