after I change my water my plants pearl like crazy. I am wondering why. First I thought it was because I was lowering the levels in my tank, but I have changed with pure R/O water with the same effect. Then I thought it was changing my kh so the Co2 was greater, then I changed with water that is higher in kh than the tank. I am just trying to figure why it pearls like mad after I change the water. What nutrient is causing this. The pearling happens right away within minutes. After a few days it slowly goes to little to no pearling but the plants are still growing ok. Any ideas?