cal mag issue?

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Hey guys, thanks for taking the time to look. First grow. Fast buds girl scout cookies auto 11 days from seed. I believe its a cal mag issue but I can't tell even with a day of research. Spots started showing up yesterday, haven't started nutes yet. In 5 gallon bucket with plenty of holes drilled for aeration and drainage. Organic potting soil with worm castings, 1/4 part miracle grow potting soil mixed in. I would appreciate any help greatly.
 

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do you have this outside during the day still of is this inside 24/7 now?
 
I started to get little brownish spots, similar to yours, but I reckon it was down to droplets of water being left on the leaves and possibly burning under light. As soon as I stopped spraying seedlings, the problem went away
 
:toke: Cheech-- too soon for any sort of defc. issue,... spots might be from lensing burn, like Cat mentioned, otherwise, I see nothing alarming here... younger leaves tend to show minor things like this with no significant problem behind them,..
 
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