Hate to be cliche but everyones tank is different and I or anyone here could tell you how much you should actually be dosing. I would suggest, finding an accurate ph drop. If you aren't achieving atleast 1ph drop without fish stress, that typically means circulation is an issue. Lack of co2 will/could/can show the same fert like deficiency symptoms. The amount of co2 will typically be judged by the amount of light your pushing. Sorry if my reply is of no help
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