Magnesium Problem?

Plant info: soilless mix, ph ~ 6.8-7, 36 days into flower.

I thing i'm having a Magnesium Problem and i just wanted to double check. I haven't had any problems other than over feeding the plant with nutrients, and have backed off of them for the last 2 weeks. they were doing fine until the last few days.

The affected leaves are the older fan leaves, the new growth show no signs of discoloration.

I had a leaf that looked like it was infested by spider mites, but didn't find any. it turned out 2 days later that the whitish yellow spots grew into yellow patches. here is a shot from 2 days ago (DSC09353)

the other two images are 2 leaves that had similar characteristics as above but are now yellowing
 

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