Appreciate the tag Grow Bro. @Lozzie do you have any run off numbers to go on? Assuming a potassium and Phosphorus deficiency. Run off PH and PPMs would tell us what this is in the medium and if the PH is causing the deficiency or an abundance of salt driving up the PPMs which also tanks the PH. Soil PH range 6.3-6.8 and a target run off of 900-1200 PPMs 
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I do not have any numbers - that is one thing I have not monitored. I grew the last one without and figured ok - I guess I have to make a purchase…what exactly do I need to purchase? I am just growing with growlight, water and nutes nothing else. No other supplies
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TDS Meter Digital Water Tester, DUMSAMKER Professional 3-in-1 TDS, Temperature and EC Meter with Carrying Case, 0-9999ppm, Ideal ppm Meter for Drinking Water, Aquariums and More https://a.co/d/8aRZPRt
PH Tester, TDS PPM Meter, Soil PH Meter 3-in-1 PH/EC Digital Kit - Lab PH Meters, Soil Moisture Tester, TDS and EC Pen Combo for Water, Home, Hydroponics, Plants Garden Soil and Aquarium https://a.co/d/cSWOPx8
Theses are all lo tech there are alot beter ones but it would assist having a better Idea, what I found was that the soil maintained them 2 months before needing nutrients.
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You got em @Bunger64
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Thank you! I will order them right away for next day - should I order both?
Exactly the questions I was about to ask. 
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Looks like your in good hands. Good luck with her @Lozzie !
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If you have a PH pen I would run straight water at 6.5 to liberal run off and catch and test that. It’s a start and will isolate if it’s PH
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