I am confused about the ph of your water reading 6.8 when GH and KH are extremely high. Maybe I am wrong but there is a correlation of ph to GH and KH. Your water ph should read much higher than 6.8.I use leaf zone liquid fertilizer every other week and I only put in root tabs once. I got them from a local seller. They’re not branded
My tap water pH is about 6.8 consistently and today. Now I ran out of GH and KH strips. But both typically always run on the extremely high end of the spectrum. Those are always very consistent. I need to go buy more for those tests so I have numbers for this week. And the GH and KH are always super high for both my tap and tank water.