Does this look like calcium/magnesium deficiency?

Cactus92 said:

Nutrient rich soil grow in a very small pot
RO mixed with tap water 80/20 when top is dry.
Signs of deficiency started 1 week ago. What could this be? I'm suspecting it being lack of cal/mag- should i even bother trying to fix it, when it's so late in flower?

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Cactus92 said:

Yes it's really cool - the bud does thickening everyday, suprised me too

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