What Nute Deficiency Is This

Overwatering for sure, but that is definitely an early cal/mag deficiency. I'm guessing you forgot to add dolomite lime to your soil. This is easily rectified, but stop watering so much, twice a week is probably plenty ( depending on the environment ).

LocknessMD said:

Any updates on the results? After squaring my Veg room away (brand new room, first time grower) with its environment issues (heat) all the new growth looks really really good. Was it Cal or Mag in your case? You're plants looked a lot like mine did so I thought with the change in outdoor climate (summer's here) it might be that Good Luck!

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Yeah, the results are they were in a newly constructed vegging area which initially had no fan and no humidifier.

Even thought they were under T5 lighting it was getting hot and there was also low humidity in their.

The soil is/was very rich with added organics.

So I bought a fan and a humidifier for that area, so that alleviated the heat stress.

I also just watered with just water for that period since the soil was so rich, so that elevated the pos nute burn.

I started watering less and administered some mag, after which the problem ceased.