Just can't seem to get it right

Newgrower4now

Active Member
Any help on what is causing this problem I was having the smaller leaves turning yellow and dying on the bottom of plant I Associated that with not getting enough light so I upgraded to a thousand what HPS now the bottom leaves for the most part have stopped turning yellow and I got off but now it seems like my tops are getting a yellow tint to them instead of a green tent like the rest of the plant has this is my very first grow my pH seems to be staying right at 6 no matter what I do it hasn't really gone down below that I just switched to the 12 on 12 off 5 days ago
 

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