Diagnosis Needed

I've attached two pictures. One of the plant it'self and one of the leaves. I did three leaves to show the progression. The tempurature in the room is between 75-80 (400w HPS about 12" away), pH is 6.7, I'm using 1/4 tsp 60% phosphorus (some bloom stuff from the store) per gallon of water, and 1 tablespoon of Calcium/Magnesium supplement. The leaves are from the plant at the top left in the middle of the bud. Out of 11 plants only three have this condition.

i think that means they need P. i could be wrong. i would say nitrogen because that's all i ever say. it's the brown spots that lead me to think phosphorous.

looks like you're burning them somehow....The 6.7 ph is the ph of your soil runoff?

I think it is phosphorus, too. I also think it might be too close to the light as I noticed the three that are similiar are closest to the light. Thanks to both of you.