Light Bleaching?!?

WW week 7 veg from seed indoor
Organic soil w worm castings
PH 6.5
FF nutes 1x per week 1/4 gal a plant
Reg water 1x per week 1/4 gal a plant
SF 4000 LED at 30% (just turned it up from 20 2 days ago)

I’m 99% sure just want thoughts.

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It’s an older leaf, could have been light burn at one time, could have been calcium at one time. Top leaf looks good, so I wouldn’t worry too much.
Normal to lose a few fan leaves along the way. Especially lower growth that doesn’t get the same amount of light as it did when the plant was smaller.

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