My friend has a huge reef tank that has over 50 different corals in it. He uses reef crystals as his mix and does a water change weekly. The only additive that he uses is calcium. I am sick of adding all the chemicals, and I often forget to add one or two. I am thinking of taking this approach, but wanted to get everyone's take on it first. Any one here use reef crystals, and if not, what do you use and what additives do you use? Thanks!