I currently have an issue with my water changes. My current salt butch has a KH of 7dkh calcium of 480 and magnesium 1400. My tanks dkh is around 8.5 my calcium is a bit elevated at 490 and my mag around 1450. I do a water change of 50 liters in a 370 liters volume so its about 20%. My problem is this, i try adjusting my kh to meet my tanks dkh so i add aquaforest part 2 pro. I also add part 3 ( the mag) but i dont add part1 calcium since i want to drop my tank levels calcium level. When i adjust the dkh in the waterchange after a few hours it drops again. Why is that? Is it because i am adding it too fast and causes ph spike that cause precipitation? I dont know.. any thoughts and solutions ti keep the dkh at the 8.5 mark before adding that water to tye system?