So I'm a little lost regarding water chemistry. I have 180 gallon tank and use an RO/DI unit to make water for water changes and auto top off. I have over 100lbs of holey rock and at least 100lbs of zack black eco complete sand. I use seachem Cichlid salt and Malawi buffet. I keep my PH at 8.4 and have never really tested water hardness or alkalinity. I've never had a problem with the PH. However, I bought a pinpoint water hardness meter and the results came back rather startling. My main tank showed 2,200 microsiemen which converts to a DH of 66. Which is way too high according to recommendations for a Malawi setup. I then looked at my RO water and after adding salt to get to roughly 500 microsiemen or 15dh. The PH was roughly 7.8. I added Malawi buffer to get to a ph of 8.4 and my microsiemen went up to 1312 or 40dh. Can anyone offer insight on what I'm doing wrong? Or how I can increase the ph but not the DH?