I finally got a test kit (I am getting ready to set up a DIY CO2 on one of my tanks) for GH and KH. Both are extremely low (I can't remember the exact #'s, but it was as low as the kit would read). Can anyone recommend a good product for raising these before I start with the CO2? I purchased a chemical called Tank Hard because it was all my LFS carried, but I am re-thinking my decision. Sould I be adding something like RO Right or Equillibrium? I should be concerned with raising these right?