I guess there is no perfect answer to KH/GH? What are some thoughts on this. It seems like a fairly small piece of the puzzle.....but as with anything else, it becomes a large piece when discusses. I havent seen anybody give a solid reasoning for their thoughts on GH/KH. Will anyone venture to offer the "ideal" GH/KH levels? And more importantly.....a reason for there choices? I live where the water is uber hard......so i mix with RO/DI. My tank's water conditions are 4.5 KH and GH....but I dont know why this is good or bad?