Although some of the information you have given me today has actually been new to me, i will be sure to pass it on to my other friends what I have learnedI do have kh/gh test kit as well as a few master test kits, I currently have 6 tanks up and running, a 30, a 55, 3 other 20 gallons, my feeder tank and my shrimp breeding tank, I am a tad obsessive with my fish keeping a bit , so I try not to leave any areas to chance for the life of my fish