plant problems

i feed calmag in every watering especially if you are using RO or distilled you will want to. tap water has minimal cal/mg in it.

leeach he means flush. running a good watering thru it.

spotting is due to not enough cal. possible soil ph to low locking out cal. light yellow to lower leaves in low N.
 
You're growing it in a trash can... it's adapting to its environment...

:)

Did you drill holes in the bottom of that container?
 
And you might want to work your lights back to something like a 20/4 schedule. Let the plants get some down time to recover while you are working this out.
 
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