Hi Liz,
Don't know if this is worthwhile enough or not, but my 75 gal RCS/BN tank is doing great. I just did a water change yesterday. My pH is at 7.4, and my hardness from a digital meter is 150 ppm. I don't currently have GH and KH kits, but it's a well/RO mix. I checked and noticed my temp was just over 80, so I lowered it. I recently got several local customers from CL lined up. I offered 10/$1.
Steve