Need to add calcium, EC going up

A question from a fellow grower:

my plants get sick and i need to add more calcium to my tank but then EC going up what i need to do add more water or leave how it is , ?? becouse on calcium botle says add 1-2 ml per 1 litre of water , so if i add more water is not gona be 1-2 ml per litre

Camg is 1tsp for light feeding and 2 tsps for heavy feeding, what is your EC reading, if I’m not mistaken every 0.1 or 0.01 is equal to 100 ppm I forget which one it is, @MacGyverStoner can I get an input so I don’t lead this person down the wrong path

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hi guy im gona sent u couple pictures my leaves got spots and guy told me i need calcium im using canna stuff

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help guy leaves curling and some of them spots

Leaves curl and claw= nitrogen toxicity

what about spots on leaves

Usually phosphorus and potassium deficiency