Just checked the parameters of my tank and my Calcium seems to be a little high at 540 ppm. Is that any cause for concern, or is it ok? My KH is at about 180 ppm (10dKH) so that seems normal. Don't those two work in conjuction with each other? I did a water change on Friday and I haven't added any supplements at all. I don't have any test kits for magnesium or strontium so I'm not sure what those levels are at.