Wow, i’m So glad I saw this post. My PH is dropping/has dropped to 6, as well. I must admit I do not understand the KH test. One drop changed the water in the test tube to a very pale green. It got a little darker green with each drop I added......all the way to 7 drops. Does the changing to extremely pale green with the first drop mean my KH was 1? This was my tap water. Guess I need to find some kh+. The ph out of my tap (well water) is 6.4, but I store up my change water and that water measured 7.something (can’t remember)——just know it was in the 7s. Nine Gal. Dennerele shrimp tank, heavily planted, catappa leaves, mineral rocks, spiderwood, Dennerele ‘soil’/substrate. All other water parameters are in normal range. TDS 250. My shrimp are reproducing, but i’m Still losing some adults and probably some babies.