So my cities tap water which I use in my tank is really high, about a 8.8 on the scale. Naturally this caused some issues for my fish. I've had peat moss in a media bag in my filter for about a week & a half now. However, my ph has only gone down to about 8.2, which is still too high for the fish I'd like to add in there, corys. My glowlight tetras don't seem to be having an issue with it. So, what do I do at this point ?