A week ago I notice a couple leafs were starting to yellow outward to inward, then a couple more leafs, now the older yellowed ones are starting to turn black in the middle of the leaf. Any suggestions?

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Could you tell us more about the grow? pH? lighting? nutrients & schedule? watering schedule? etc...

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ph levels have been around 7. This is a soil grow with MG moisture control, I water about every other day, sometimes on the 3rd day. I have foil over the top of the soil to help reflect light upwards. I use fox farm grow big for every other watering. The room usually stays about 70 degrees with a 600 watt metal halide with a lumatek digital ballast outside the room and a sunleaves artic hood.

Ph is a bit high...6.2 - 6.8 for soil grow...I'm not a MG fan, its usually pre-nuted/moisture cont., easy to OD on nute/water , hard to come down...Mylar or flat white paint instead of foil.... I'd fix the PH 1st.. luck..

room is painted white, i just use foil over the soil to help reflect upwards on the lower leafs, plus it helps keep the light from drying up the soil so fast. I just looked it up on the plant problems in GrowFAQ. I have a nitrogen def. I will be getting some stuff tomorrow to help take care of it. Plants have actually been doing great, they did seem to be stunted for a while, but now the leaves are getting huge and the whole plant is getting more and more bushy.

This is a medi bud straing of marijuana-seeds.nl

Looks a lot like the THC Bomb I got going on right now