I just can't leave it alone. It kills me to see my ph get down to 7.75 at night. My corals and fish look fine, but I do not want to wait until I lose something to figure this all out."]
Since your original question has been answered I'll add to your reply. If you are using a meter to check PH, I would suggest you make sure it has a fresh battery and is properly calibrated. If using a test kit, they are not accurate imo and I would not trust them enough to make ph changes to my tank without verifying the results. Next....if your water chemistry is balanced with Ca/Alk/Mg levels all inline, then ph will take care of itself. If your critter's and coral are fine now I would not try to reach some "magic" number. I was told long ago to never chase PH because that is seldom the root issue.
Cheers,"]
PH monitor is spot on in calibration. I back it up with salifert ph test. The issue is my other measurements are in line and the ph is not taking care of itself. It is driving my NUTS!!! the only downfall beside sightly high alk is my phosphates are up a little. I have done three 35% water changes in three weeks, and I am using pura phoslock. I love this hobby!!! My biggest downfall is I can not stand when things are not right. I am not an expert, but have a good grasp on the general idea of reef keeping. This just another opportunity to learn I guess.