I added crushed coral to my tank to bring my KH
up, as it was at basically O according to my test strips. And to raise my PH which was at a 6 according to the API MTK. Now my KH
is about mid level 80 according to test strips and 5 drops according to API kit.
My PH is at a 7.6 which I believe is too high for my tetras and betta, and I would like to add cory cats which all require about a 7.
How do I lower the PH without upsetting the KH
And just as a side question how often do I need to change out the crushed coral.