Hi All, My tap water's Ph. ranges from 7.6-8 normally. I was concerned about "other" factors in my water. It's also fairly hard. I don't recall the exact measurment. Maybe 150-200ppm. I was going to use an RO/DI system to remove "other" factors in the water I can't test for. I'm looking for consistancy. Am I being too cautious? I'm of course going to use arganite base substrate to keep the Ph up and the water hardness. Options? Thanks!