What deficiency is this?

leaves that are affected will get worse its too late for them watch new growth

So first of all what I see is leaves corking like a taco, very dark almost plastic leaves and yellow leaf tips. All of these are signs of over feeding. So You'll need to flush the plant with water to move any excess nutrients, wait for it to dry out. Make sure you don't water on the leaves when the lights are on, this damages the leaves. And check your pH levels are correct, maybe your meter is wrong? Try raising the pH a little more? Maybe all these nutrients together are causing some fluctuation? Hope this helps you out I will follow you along! 🌱👍