Is this nute burn? Or too close to light? Or the nug turning purple bc temps?

Specifications:
Temp during day ~80F
Temp during night ~65F
Ocean forest soil with natures pride top dressing
Fabric pots
Spider farmer SF1000D light fixture
1.5 x 2.5 foot tent
Strain is northern lights auto

It appears the tips of this one single nug at the tip of the cola look to be a different color. I don't know if its nutrient burn (which I've done in the past), or if it's light burn (being way too close to the light), or legit just the strain.

I'm just confused though because it's only this single nug and no others. Everything else looks healthy, full, dank and crystaly. I looked at my jewlers loupe and the trichomes on the discolored parts appear to be amber.

**Side note should I trim all the leaves? theres so much blocking nugs
Pics:
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