The blue bulbs may be actinic (used for SW tanks), so that should cut down on the watts per gallon because actinic lighting doesn't do much for plants. But if they are around 10000K or so in temperature, you would have 4 watts per gallon over the tank and I'm assuming you don't have CO2 injection. That's a recipe for algae.
I'd try just running 2 of the lamps if you can and cutting back you photoperiod (time the lights are on) to 8 hours.
Remove all the algae you can, even if you have to cut off some plant leaves.
How heavily planted is the tank? You might want to get more stem plants if you don't have many. Fast growers like Bacopa, Rotala, Anacharis, Hornwort, and some Ludwigias will be good for your tank.
If you want to run all 4 bulbs and they blue ones are not actinic (cuts down on the wpg), then you'll have to get some carbon dioxide injection. If you can't do pressurized, then setup a
DIY CO2 setup.
I would also be interested in seeing the fixture you have....just to see what type of bulbs the blue ones are.
