Brown Spots on leaves ?

So I have started to get lil brown spots popping up on my plant . Don’t really know if it’s calcium deficiency or some kind of fungus disease or possibly neither of the two , but that’s why I’m here . Really like a lil guidance on this , don’t wanna lose her if possible.
Sprouted the 18th of October , so as of today she is 54 days old . Thanks
3x3x6 tent
400 watt ac infinity light
Humidifier ( 55%)
Temperature ( low 64 high 78 )
FFOF soil
Fox Farms trio nutrients
Water ph 6.3-6.7
Cal-mag 1 teaspoon
Run-off is in high 6 Range

The plant is starving. You need to up the feed. I would give the plant a solid dose of grow and Bloom mixed 50/50. Ph 6.3. hold off on that cal/mag until you get some feed in the plant. I know it looks like a calmag issue but it is also deficient in everything so the base feed needs to happen first.

Modern Selections said:

The plant is starving. You need to up the feed. I would give the plant a solid dose of grow and Bloom mixed 50/50. Ph 6.3. hold off on that cal/mag until you get some feed in the plant. I know it looks like a calmag issue but it is also deficient in everything so the base feed needs to happen first.

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Thanks brother man , will get her feed tonight !