well there is no question that it is healthier, with no gravel you can get every single piece of poo, and you will ALWAYS miss some with gravel so it will help prevent amonia build up with no gravel. Also thats just one less place for Nitrates to build up. It is deff better water quality wise but the question is it worth sacrafising looks, and bottom dwellers comfort level. I am torn, and have not seen everyone swing to one side of the argument or the other. I have a few months to ponder this, but i dont see me comming up with a decision anytime soon.