Any ideas about low pH?

[nlreefguy]

Thanks for all the advice guys, I started up the kalk reactor so we'll see what happens. I'll make a very gradual change to the pH. Every test kit I've ever used and the ones at the LFS as well were all showing my pH at 7.6 or thereabouts. I know it's not a huge cause for concern and I wouldn't worry about it at all normally but last week I dosed kalk by hand a few times and I just found that the corals seemed to really appreciate it. Was it the pH? I don't know, but I'm dosing kalk now anyway so whatever!