When you are half way dead in the future, I would lock away dangerous chemicals.
, you could very well have caused a major disaster. You cannot add the powder directly to the tank, it must be dripped because the PH
of the kalk
is so high you can cause a dangerous PH
shift that will wipe out your tank. You can also cause a "snowball" effect as the sudden shift can cause the calcium tank to precipitate out of solution.
To be blunt, if you are not testing for and noticing a deficiency, don't dose ANYTHING. If you do need to dose, do so appropriately.