Hi folks please could you confirm if I've got my numbers correct for the following scenario. I have a 60 L planted aquarium which is low in potassium. I need to raise the potassium content by approximately 14 parts per million (incrementally of course). I'm using potassium gluconate tablets and each one contains 90 mg of potassium. I've calculated that I need to add 9.3 tablets in total to to increase the potassium level by 14 parts per million. Does this sound right please? Many thanks in advance.