I've just gotten hit with it, and I'd like to try the ol' "don't change anything and see what happens" plan. I have 3 f17t8/865s over a 10 gallon, which adds up to 5.4 watts per gallon, so I'm sure that has something to do with it. I only got hit when I started injecting CO2 though. I've decided that I'm going to just let it go for a while and see if it wipes itself out. Presumably the algae bloom will exhaust all of its own food and slowly die out. I think the problem that I have had so many times in the past is that I have panicked and then overreacted to it. I'm not saying that's what you did, but I've never been able to just allow it to be green and really nothing I tried ever helped. Another idiot thing I was doing was waking up at around 8am, turning the lights on, and then leaving them on until I went to sleep at whatever ungodly hour. All of my plants continue to pearl though, so my tank is now a murky champagne glass. I think I'm not even going to do any water changes because that has never helped me until the algae was at the end of its cycle.
One thing I did that I think was a mistake was vacuum up a lot of this slimy hair algae I had everywhere because I think that unicellular algae has a harder time competing with slightly more complex algae than it does with real plants, so when you mechanically remove the more complex type it may open you up for green water.
As far as useful advice goes, I would say that CO2 might bring it back in the short term, but that ultimately you want the plants themselves to be as robust as possible so that the algae has a difficult time competing. One thing I did last time around that definitely helped was putting some floating plants on the surface of the tank. In my opinion, doing so is far better than blacking the tank out because light is still getting to your plants, but it greatly reduces what is being used by the algae. Also, the fact that the floating plants are really tapped directly into the water column helps alleviate nutrient imbalances that may be present. I have some azolla, water lettuce, and duckweed covering a corner of my tank, but I think I will buy a "portion" of water lettuce from the LFS and speed up its takeover of the surface. Ideally the whole surface would be covered as fast as possible, and the more you start with, the faster that is.
This is also the first time that I have ever had java moss in my tank, so I think that will help as well. My guess would be that you want to avoid trimming plants during this period as well so that you have as you have the greatest amount of plant matter competing with the algae. This is why I shy away from killing the lights because I want my plants to continue to grow, to the detriment of the algae.
Well, I hope that meandering rant was helpful in some small way.
