If your having algae problems, its usually caused by improper nutrient balance. If you have too much nutrients in the water, then the algae will prosper. Plants will use more nutrients when they are fed more light and carbon so it is likely you either...
1. Do not have enough light
2. Do not have enough carbon dioxide
3. Do not have enough plants for the ferts you dose
1. First of all, you have very high light based on
Wizard~of~Ozz's Oh Glorious Light, which is quickly becoming somewhat of a standard here at AA. (I actually went by a 90 gallon tank because I couldnt find dimensions for an 80). I don't think you have a lighting problem.
2. This is a possibility. You say you are using pressurized CO2, are you testing your PH/KH?
3. Also a possibility. First, make sure you are dosing for your size tank, however, dosing for the tank won't be accurate if you have 2 small plants in an 80 gallon tank (I'm thinking in extremes to illustrate a point). You could cut back your dosing but instead, most people prefer adding more plants
For CO2 and Fert calculations I strongly reccomend
Chuck's Calculator All of these links and many more can be found in the stickies at the top of the planted tanks forum.