I’m fairly new to being an aquarist and have been keeping fish for right at a year now. I understand the importance of water quality and recently noticed that my 29 gallon tank has an alkalinity(KH) of 0 ppm. I know that this could potentially be bad if I have an acid spike for whatever reason because this measurement is basically the waters ability to buffer acids and keep pH stable... what I don’t understand is I’ve never had this problem before! So I tested the source, my tap water, that I use for water changes. My tap water has a GH of about 200 ppm, a pH of 6.8-7.0, and not surprisingly, an alkalinity(KH) of 0 ppm. I know KH is also measured in degrees of hardness and that 1 degree = 17.9 ppm. However it’s still 0!!! Also due to this, I’ve noticed over the last week or so, my pH has gone from 7.2 down to 6.4.. all my fish are happy still despite the KH and pH change. They still eat well and have no personality changes! So what should I do? Leave it alone? Work on raising the KH and if so, HOW? Thanks in advance...