Duh, sorry! lol KH is 6 or reading as GH it's 107.4 Additionally, I just read a chart showing pH in relation to KH and in relation to carbon. If I read it correctly, I don't have enough carbon in my water (less than 10 ppm). My dry ferts should be delivered this week. I need to work on these things. The plants are growing like crazy but I still have algae on some of them.