ph and kh

jahel318

Reefing newb
I can't seem to get my ph under control. I've done water changes and my kh is out of whack also. My corals aren't liking this please help!!
 
pH 7.8 and Kh over 215ppm after a 30% water change 7 days ago. 2 days ago I did a 10% water change and now pH is at 8.2 but the kH is till over 215ppm. What am I doing wrong?
 
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