I've never had much success with Utter Chaos, and always liked them. I had a bit of a disaster a while back when my RO unit started messing up. My digital meters said I was at 0 ppm....but they were wrong. As it turns out, my tap water was about 7-8dkh before adding salt mix...which sent it upwards of 14dkh. I didn't notice it until some corals started dying. At the same time, my UC palys were doing better than ever, doubling in size and numbers. I now suspect they really like high alkalinity.