You might see plant growth in the next few days, but your lighting is a bit low. I'm not sure how much Co2 your bottles put out...it varies widely depending on the mixture you use, temp of water the yeast was added to, the kind of yeast you use, execÖ
Whatís your KH at? You can use KH in conjunction with your PH to determine your PPM Co2...
I'm not sure how much algae reduction you'll see with your water parameters. You might actually have more Co2 then your plants can use because of the low light, which will cause an imbalance and Iím almost positive you have more phosphates and nitrates than your plants can use, which is another imbalance. Any imbalance in your parameters has the potential to cause algae...the more things are imbalanced the more algae youíll see. Try using a phosphate sponge to get your Phosphate down to 2...that might help a bit. Another thing you can try is to get some fast growing plants in your tank (AKA nutrient sponges)..Water Sprite (Wisteria?) works great for this.
The general rule is 10 parts nitrates to 1 part phosphate. With your nitrates at 20, you should try and get your phosphates down to about 2. Co2 works good to control Algae at about 30PPM, but this really only works once you are above 2 watts per gallon. Your lighting is about 1.5 watts per gallon, so less Co2 then 30PPM will probably be better.