severe leaf dying problem

So im growing in soil under a 400w mh its about 3 ft and im using dutchmaster gold a and b. The bottom of the plant and middle are suffering from leaves turning yellow and dying very quickly(such as i have a handful of dead leaves a day). What is wrong? 1300 ppm 6.5-7.0 soil 78.8 degrees no evident heat stress on plant leaves.

pH too high?....try closer to 6.0 I also do not use nutes that strong, but my girls are a little bitchy (700-1100 ppm). Pics?

400w mh its about 3 ft

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Try bring the light down to a foot over the next week. But really need to see some pics as not all yellowing is the same.

I thought 3ft was the height of plant...?

hey, i have the exact same problem with mine, {check my latest thread for pics}, can u update on whats happend with urs?
and pics if possible.

peacee