I have to agree, some of the plants look like they are not aquatic plants. They will live for awhile, but not that long.
To really grow plants in a 125 gallon tank you need light, and lots of it. 80W is not going to do much given the height and size of the tank. I have 260W of compact flourescent lights on a 108 gallon tank, and that is adequate for most plants except the high light level plants.
As for the ferts, any is better than none. IMHO, there is no need to go crazy on some fert plan if plants are not the focus of the tank. Just add some commercial stuff as per the instructions.
CO2 is always an issue, but again, since it is not a plant themed tank, I wouldn't bother with it. It will help greatly, but not having it will not be an issue. Your plants just won't grow as fast.