I just got my tap water tested:
pH: somewhere between 7.2 and 7.6, so let's go with 7.4
Hardness (GH): 75 ppm
Alkalinity (KH): ~20 ppm
Sue, thanks for the recc's! I don't think I can do pygmy corys because of the pH, and the same goes for sparkling gouramis and gudgeons. I might look more into the pencilfish, but my hopes for any fish from South America is really low, mostly because of the low pH there.
A Ph of 7.4 is fine to keep many soft water species: certainly most South American tetras and corydoras species.
For the more sensitive species, however, like discus, geophagus, Uaru, and many of the South American black-water species KH/GH are a far more important number to consider.
So, Im wondering...
If 1 dKH is about equivalent to 17.9 ppm- isnt your KH and GH very low? I usually think in terms of General Hardness(GH) and Carbonate Hardness (KH)- not ppm.