Nice Blue Ram, btw...
I am thinking it is lacking a nutrient instead of it being algae. This is because in one of your pictures, the leaf that is brown is actually transparent. algae shouldn't do that.
Now, what nutrient could it be? Hard to tell but if I had to guess I would say iron. But then again, you are dosing a chem that is supposed to be putting iron back into the water. Do you use regular tap water when doing water changes? You don't use distilled or bottled water, do you? Using anything but tap water in a FW planted aquarium is not good for the plants since bottled water does not contain any nutrients.
If Corv is around, he may have a better idea about what is causing this that I do...