alk test

[reefnut]

havent been testing this so i picked up saliferts kit.I know that natural seawater is 8 dkh and that a exceptable range is 8-10dkh.my first test was9.6.ive been having troubles with my corals and thought for sure it was alk.what are all you reefers keeping yours at?i also did a 25 percent wc last night and am wondering how much change in my dkh ill see until my next change (about two weeks)?while im on the subject my water is always cloudy for a couple hours after water changes is this normal?
Thanks for the help.