I am having a problem lowering my PH level.  It is currently at 8.4 which is way to high. Alkalinity is high also ( Test strips say 300ppm+).  These are parameters that come out of my tap water.  My city gets their water from an underground aquifer.   I have been adding Muriatic Acid and it will drop to 8.2 - 8.3 but the next day it is back up 8.4.  I am slowly adding the acid as I have fish in t…