My 2 cents: Add carbon, once the water is clear, remove the carbon. The tannins will keep coming. Personally I disagree that they "look great". A brown tint to your water doesn't look good unless you're trying to recreate a naturally-tannic environment (e.g. parts of the Amazon, cypress swamps, etc...). Alternatively a spring-fed environment could be crystal clear. Even parts of the amazon have clear water. Just read a book by one of the early collectors of wild discus and you'll find that they come from a variety of environments.
But I agree that continuous use of carbon in a tank is bad. It can deplete important micronutrients and some believe it can cause lateral line erosion, aka "hole in the head" disease. My personal experience has made me a believer, particularly regarding saltwater angels and tangs.