Hi guys, thank u very much for the help. I had did a weekly 10% water change for almost a month but still high. I had bought 2 sets of calcium test kit n given same result of more than 500.
RockyBoy: my tank no snowing n yes my kh is slightly low. I'm afraid to dose kh and the rest now to control the calcium level and other parameter, correct me if I'm wrong ya. I will do another water change tomorrow n see if it helps. : )