yellowing from center of plant?! please help

grow type: outdoor
soil: roots organic and FFOF along with some earthworm castings and diatomaceous earth
water: I use water that's been left outside in open gallon milk jugs for atleast a day
nutes: Bloom (yellow bottle) nutrients although I've only used them once so far at about less then 1/4 strength

I was gone for two days and this is what I come back to. Is this normal because my other plant that was with it didn't show any of these symptoms and seems to be doing just fine but this yellowing is freaking me out a little bit....
 

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well in that case I'm happy then although I would have liked to veg it a lot longer but I guess that's what I get for starting so late this year
 
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