Hi
When you say "blue green" do you mean fixed attached types or the sheet forming smelly ones?? lol Sounds like your tank is not overloaded >How about water changes??
I recently setup a 150 in direct sunlight and I'm getting the fuzzy attached bright green types but so far very controlled. I'm using Chinese algae eaters which do a great job and 10 gallon a day water changes. All the plants are doing well and are staying clean.
I suspect no matter what you do every tank will eventually get some type of algae. They are sooooo adaptable. gary

It doesn't sound that bad and i'm sure its nothing a few corydora's or plec can sort out. Try not to overfeed while the 'clean-up crew' are doing their work.