huge ph drop

[Just Jim]

my calcium reactor got turned way up and my tank went from a ph of 8.2 to 7.02 in a matter of hours! Nothing has died yet, and I need to know what's the best way to save everything. I don't want to start raising it because I figure the shock would kill off a lot. I'm going to check the alk now, some advice would help....

[Just Jim]

luckily the dkh is 9.8 so it just is the ph I need to worry about...

[bertoni]

I'm skeptical about the pH of 7.02, since the live rock should be dissolving. I'd check for electrical interference or some other testing issue. Also, turning off the reactor for a bit should allow the aquarium to outgas some CO2, which would raise the pH.

Is the output of the reactor going to a skimmer?