cannabis cotyledons have brown spots on seedlings

I may be overreacting here, but I want to just make sure. My cottledon has a brown spot on my mango kush in a 2 gal pot but only watering the center by plant. I have a 2 x 5 x 2 x 5 x 6 Grow tent. Humidity is steady 50-70. I’m using Fox farms ocean forest soil mix with a third perlite. I’ve been feeding straight bottled springwater. I’m running 2 150 W LEDs they are supposedly equal to one 600 Watt metal halide or high-pressure sodium at 24” above as per recommendations provided by the manufacturer. I just want to make sure I don’t have to add any Cal Mag. & this is normal. Any help would be great. Thx

PS.
I got two other strawberry coughs with same everything and there fine.

Natural light pics when asking for help

Raise your light start at 30” and let your plant grow into your desired height.

Your over reacting for sure.

Those are only there to collect energy to grow the new leaves. The new leaves are out. Your fine.

That's normal from kicking her helmet off

Also just thought I would mention that the manufacturer also states that seedlings can go anywhere from 24-36” could it possibly be to close to the lights? Since the other ones are fine I assume that the lights are a good distance away. Any thoughts would be greatly appreciated. Thx again

Dreminen169 said:

Also just thought I would mention that the manufacturer also states that seedlings can go anywhere from 24-36” could it possibly be to close to the lights? Since the other ones are fine I assume that the lights are a good distance away. Any thoughts would be greatly appreciated. Thx again

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Again. There is nothing wrong with that seedling. I promise. It is normal stuff