Rinse new ME 70/30 w/ calmag? Added perlite?

I highly recommend pre loading or buffering or whatever you wanna call it - ME 70/30 I’ve been using it extensively for years and some bags need it some seem better buffered. In fact It kinda pissed me off cuz I assumed it was good first few bags were good but last couple had issues. I usually would just do something around 1.5 EC including a good cal mag dose.. let it sit like that for a bit then rinse.

i don't see a clear symptom of Ca or Mg. one yellow-tipped leaf is soething else and maybe no big deal. hard to see anything, but maybe a N-deficiency. some leaves look like they are yellowing from tip-in and on lower nodes. Ca deficiency shows symptoms about 4-6 weeks after it actually starts, fyi. Mg is a mutually exclusive nutrient that may or may not be low when Ca is... so becareful of what else you add to correct a problem... could cuase a new one.