brown spots/ still no sex!!

mg soil (dont hate)
4 cfls 28w each 2700k
watering roughly every three days (when container is light)
NO NUTEs...

3 plants one found out to be a male after 12 days of 12-12

other 2 still have shown signs of sex ? is this normal ? am doing something wrong?

also plants are showing yellowing and brown spots? any clues or ideas what this could be?

ph prob maybe? i dont know?

any ideas i can do to the plant to make it greener.
 
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