My system is also in the basement. I have my skimmer pulling fresh air from outside. and my pH is normally around 8.5 Outside air feeding your skimmer would prevent you from having to mess with kalk.
I hear you there. I'm always looking at my graphs as well.To be honest, before I got my Apex I NEVER tested for PH and my tank was fine. I never lost a coral or fish in tank (had a jumper) but now I find myself constantly watching my graphs to look at my trends.
then he wanted to run kalk to keep his cal and alk on point for some sps he will have in his tank and give his ph a boost.i can't wait to see some pic's