There isn't a need for co2 injection considering the plants currently in the tank. For ferts, that will depend on the amount of nutrients in the water, and the rate that they are taken up.
There are two seperate driftwood decors mounted on slate. Each piece of slate has about 3 pieces of driftwood. I understand co2 is not needed. Co2 is not needed for a lot of plants, but it sure makes them grow faster and healthier if nutrients are available with the correct lighting!