Only one of many of my girls are Yellowing... what?

Check the pics out, not the best. but the first one is yellowing. the second pic is of the others that are doing fine. Soil grow w ffof, ph 6.3 , temps 83 on ave, hum has been up a bit, under a 600watt hps.

im wondering if its yellowing because it requesting more food than the others or maybe i need to add some cal mag. im exactly at 4 weeks flowering. what route do you think i should go with this... add more nutes or start adding calmag into my water. also should i pull the yellow leaves or let them complty die and fall off???

Thanks for any advice

anyone have two or cents for me

what do you guys think????

is the light closest to the plant that is yellowing?

at 4 weeks flowering a plant is expected to lose its fan leaves if it is putting all of its energy into making buds

bl33b said:

at 4 weeks flowering a plant is expected to lose its fan leaves if it is putting all of its energy into making buds

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i figured that and thats what i was going with. its so weird that all the others may have one or two lower leaves yellowing. this one is yellowing in all different parts. it has a nice solid nug going though.

E.T said:

is the light closest to the plant that is yellowing?

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no i move all my plants around every couple of days.