Right on! Thanks Keith!
Regarding your question: Your best bet is to do a 50% water water change, and do a black out for 4-5 days, followed by another 50% water change. This should reset your water column, and get rid of the green water. I use a UV sterilizer, but the few times I've had green water, without the UV sterilizer, the only way to get rid of it was to do a the black out.
If you have a smaller tank, this should be too hard to do....just turn of the lights and drape an old blanket or two over it. Make sure that NO light can get into the tank at all!
Your fish will be fine, and your plants will recover quickly as well from the blackout period!