Ph is 8.4, do fine and hadn't bought an alk kit due to never having tank issues in 3 years, plus all other inhabitants (including a Derasa clam as well as other LPS corals) are doing fine. However, I have one purchased, just waiting on it to come. I did move it up closer even though it shoudln't have been shaded since there is nothing but that in the near vicinity to shade it. I moved it more in flow to since I figured I would try a few things. I have 2 250w Metal Halide over my 75. I'm hoping with the move - albeit a slight move, it will come back or at the very least stop receding.