I'm using Kent marine salt the alk was at 9.5 a few days before the wc first water change I had done in a month. Which from what I have read for dosing alk 1 point change is an acceptable amount for increasing. Nothing else seems to be mad just this one coral. I'm still pretty new to this I have a little over 100 gallons of volume so I figured 30% wc wouldn't be too big of a deal? I come from an estimated index planted tank so I'm use to doing weekly large water changes so learning this small water change game