I do understand that part. I actually just ordered the ferts and downloaded the calculator and was playing with it a few minutes ago.
My question is about how you change the amount of one specific component after you have already mixed all the ingredients together and have been dosing it. I've read about people having algae or a deficiency, so they tweaked the actual ratio of their ferts- phosphate, for example.
Would you just add a little extra into the bottle?
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