Just measured my parameters after a 25% water change. The general hardness is still the same, KH has dropped to 13 and pH is 7.4. Have uploaded a picture of my tank to give you an idea of size. Its 275L.
You might want to check if those rocks are calcareous. If so, you might want to change them with something else that won't affect your water parameters.
You might want to check if those rocks are calcareous. If so, you might want to change them with something else that won't affect your water parameters.