Question for those of you running calcium reactors

[Delphinus]

The question came up in the chatroom a few nights ago posed by VWGuy, what is your tank pH if you're running a calcium reactor?

It seems the reactor will pull down the tank pH a little, is this of concern at all. How low is too low?

I was reminded of this question when I cruised on over to SMiller's (over at RC) site http://www.angelfire.com/home/fishpage/home.html. He lists his parameters as Ca 480, dKH 14, and pH 7.8-7.9. The Ca and dKH values are ideal, but I thought we didn't want our reefs to dip below a pH of 8? (It's not like his pictures show anything suffering, so I guess it's OK to have pH around the high 7's instead of the low 8's??)

(So ... sorry VWGuy I didn't mean to steal your question but now you have me wondering!)