Unknown plant illness! Please help!!!

DangVsang

Member
Im growing indoors with a 1000 watt HPS(hortilux). Im growing in my walk in closet and the ventilation is good do to a window located in the closet. I use Fox farm nutes and purified water from a water store up the street. The water food schedual is good to go.
The strains infected are GC and other bastard seedlings ranging from mature(about to flower) to 8 week old seedlings.
I have brown spots appearing usually in the middle of the plant and yellowing of the leaves. It does not start at the edges of the leaves, rather, it starts in the middle and works its way entirely throught the leaf causing it to brown/death:cuss:
Im confused and becoming frustrated by not undersatnding what has gone wrong with these plants.
Your valid responce is greatly appreciated and any info that helps me is freaking god send!

Peace and Greens
DangVsang
 
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