Calcium deficiency?

Hey guys,

Wondering if this is calcium deficiency?
Ph is 6 and run off last checked was 6.8

Growing x3 auto girls scout cookies
Soil: biobix all mix
Light: spider farmer sf2000 hanging approx 20" at 100% with additional viperspectra p600 for extra w, same hight at 100%

Age of plants: 5 weeks from germination
Nutrition: bcuzz

I was following the bcuzz grow guide but was causing n toxicity. Last 3 watering was plain ph6-6.5 water. I noticed this problem and provided 2ml per L a+b with 0.5ml per L blossom stim and 0.5 per L soil booster yesterday (4L of water).
Not sure if this is spreading since yesterday but wondering if its calcium def which will hopefully stop now I'm feeding again? What you think

JordanZz said:

Wondering if this is calcium deficiency?
Ph is 6 and run off last checked was 6.8

I was following the bcuzz grow guide but was causing n toxicity. Last 3 watering was plain ph6-6.5 water. I noticed this problem and provided 2ml per L a+b with 0.5ml per L blossom stim and 0.5 per L soil booster yesterday (4L of water).
Not sure if this is spreading since yesterday but wondering if its calcium def which will hopefully stop now I'm feeding again? What you think

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Calcium's immobile in the plant, meaning new growth is affected first, it's not calcium deficiency.
Keep it up with nutrient from now, plenty runoff, you should be good.
You need an EC meter if you haven't one already.