I use the API liquid test kit to measure my KH and GH, and I am really confused :confused1:. In the back of the instructions is a conversion chart for the test readings, and it has two different units of measurement: dKH and ppm. So, does dKH measure KH and GH or just KH? Also what degree is considered hard and what soft in a planted tank? My KH is reading about 8 dKH (143.2 ppm) and the GH is 9 dKH (if you can use that unit for GH) or 161.1 ppm. Is that really hard? Any advice is welcome :grin2:!