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It looks to be a bit of light burn to me.
has any of the leaves been wet when the lights on?
the rest of the plant and it upper growth is looking healthy.
I would not worry to much about it as its not spreading.
When will you be starting your feeding of nutrients?
and what kind are you using? crystal/liquid slats or dry amendments?
Let me know if you need any more help with this, you can use the DM feature.
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Cheers,