My tank has always struggled with PH, I averaged between 7.87-7.98 is, but hardly ever above 8. Recently we started getting colder weather than normal here in Florida and my PH has skyrocketed to 8.12. I tested last night and my ALK was at 8.7, Cal 450, Mag 1300. I am dosing 60ml of ALK using a APEX DOS (through the day on alternating schedule of CAL) and Cal i dose 42ML. I've been dosing Kalk as well (30ml) to maintain parameters. My tank is just about 1 year old now. Should I be concerned about the PH swing? I don't see anything fainting or convulsing, but I'm sort of a rookie and want to make sure I'm taking the appropriate steps to maintain my reef tank. One other thing to note is that previously I was not able to grow cheato in my refuguim and as of late it started to grow nicely. This is my Kalk programming in case it helps. Fallback OFF OSC 040:00/001:08/018:52 Then ON If pH > 8.35 Then OFF If KalkSw CLOSED Then OFF Any input advice would be appreciated.