Using the API tests to check my tap water, my KH is 10 and my GH is either 0 or 1 (changes color with the first drop). I bought some GH booster to raise my GH. I've read in a few places that you should match the KH and GH, but is it really necessary to get my GH up to 10? I'm not sure what the benefit of matching the KH and GH would be. I'm assuming that getting the GH to about 6 would be sufficient? Also, since 3/7 of the GH booster is potassium sulfate, would I still need to dose additional potassium as a fertilizer? Thanks.