Steve, as with anything, it's all relative to what you want to accomplish. Judging by your talented aquascapes I believe you will try to go to the extreme. If you want "Amano" looking tanks that are picture perfect and golf-course-groomed, then go with co2.
I personally prefer a more natural look with algae growth and normal leaf deterioration on my plants.
I have attached several pics of my 50g breeder that I kept when I lived in Garden City. This tank was done without using co2.
I had a double lamp T-5 fixture with an additional 8hrs of natural sunlight via the window, a thick layer of clay-based gravel with flourite, and a boat load of fish supplying plenty of fertilization. The tank had well over 200 fish!!! And, as you can see, there were a ton of plants to balance the entire ecosystem.
When I was a kid, I actually had a similar tank set up without any added electric devices. No heater, no filter, and no lights.
That to me, is an accomplishment when you can manage to balance those factors....quantity of fish, plants, natural sunlight.
I didn't even have to feed that tank prepared foods.







