Calcium should be around 350-450ppm, Magnesium around 1300ppm. Also, kH needs to be between 8-12. All these 3 parameters go hand in hand, so neither parameter should be too far off(Eg. low calcium but high kH).
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A fishtank is just like your computer. When your tank crash(OS crash), its time to cleanup(reformat hard drive) and setup(install OS) again and add new livestock(re-install software).
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