like said above go off how they look
just start 0.2 above your background ec and take it from there. you can check the run off ec and see how close your getting to what going in. if you can match it you have found the sweet spot for them, if its much lower than whats going in then they hungry, higher be to much.
keep calmag out the feed and foliar spray them twice in veg, this will help reduce salt levels in root zone, and like type M said get some silicon in there to, start that when the 2nd set of true leaves appear at 0.5ml-L
And rhizo or katana roots or whatever you decide to use can be dropped 2nd week of flower as it just a waste as the plants will focus on bud production not root production
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