Ok folks, look here. What I am about to say is highly controversial. There are a million theories about why this does not work and is dangerous for your aquarium. I know this, but I choose to ignore the comments. Why? Because it is theory. In practice, i have done this personally a dozen times without any problems. And i have told another hundred people to do it and it works, without problems. So, i don't worry about theory. I worry about results. For the last 15 years I have been on the internet telling people to do this. NOBODY has EVER had a negative experience from this, when following my lead. So, here goes...
Turn off your light. Cover the tank with a dark blanket. Do not touch the aquarium again for 48 hours. Do not feed. Do not remove the blanket. Do not do anything. Nothing. Zip. Don't clean the filter pads. Don't do anything.
At the end of 48 hours remove the blanket. Turn on the light. Change 50% of the water for 3 consecutive days. Congratulations, your green water is gone.
By the way, you have green water due to excessive nutrient input. You need to identify what part of your aquarium routine is inadequate, or the problem will reoccur.
In 7 days i would appreciate it if you would post, telling all of the people who are about to criticize me that Pasfur, was in fact, right.