Yeah, it sucks, I know. I had 2 solid green tanks for the first couple of months that they were set up. I kept using my diatom filter to clear it up, but it would keep coming back again and again until the plants got fully established. On the plus side, the green water kept all the other algae down and when it cleared up, the tank was virtually algae free.
Two 1 GA desktops, a 5 gallon, a 2.5 gallon, a 10 gallon, a 20 gallon, a 25 gallon, and two 75 gallon tanks, all planted.
I am an expert on algae, so ask me if you have questions. I know how to grow it, just not how to get rid of it.