Pls help me with my babies

I am growing 2 Northern Lights Auto by nirvana. I am at week 7 and I am using 4 25w cfl's in a pc case, the light cycle I use is 16/8, and i bend them due to limitations of space. The one on the left side of the photo has yellow leaves. At first I though it was a nute problem or over watering and I reduced the amounts. What is your opinion?

Possibly some micronutient problem, magnesium possibly which can show as slight yellowing round the edges (epsom salts helps that ). How is the new growth on the plant? That's the most important thing. (hard to tell from the pics)

I will give them some micro, thanks for the advice, will post and some more photos