Hello all! I’m setting up a 5 gallon Cobalt tank that will be CRS, nerites and assorted mosses on driftwood. My water at work (my tank will be at my desk) is quite soft as it is treated because I work for a brewery. The GH takes 2-3 drops to change to green with the API test and the KH is like 9-10 drops. What would you recommend to be the best way to bump that GH up to like 6-8 and not substantially raise my KH? Thank you.