My ph is at 7.7 . My alk is 3.25 meg/l or 660ppm. my cal is 400. I did a test by aerating tank water outside and the ph went just to 8. to test co2. I was thinking kalk but not sure how I would maintain without overshooting cal and alk. any thoughts. Could 2 part help. I have some just not much demand yet so I have not used it.