m0useanswered grow question 12 days ago Looks like issues with Mg, Ca, K to me and maybe P.
Get more runoff when feeding and lower the feeds EC value.
a high ec is not great but what its high in is also called into question. if the EC is all Ca then its going to be deficient in everything else.
Check that what your feeding them is well rounded and when watering them do it slowly over time. I don't mind biobuzz but don't let its PH get low it likes it a bit higher 6.5-6.8 is fine.
Follow their feed chat and mix it up to the correct ratios, then dilute it down to the desired EC and water in. Can also use a wetting agent to help the water flow.
Good Luck!