Deficiency? Please take a look at pics 2 plants

Hi,

Noticed some problems on a couple of different plants of the same strain. Using Pro-mix BX nothing added and watering with Grow Big. Don't think I over-fed them, as it doesn't look like a nutrient burn. They didn't get too close to the lights, they were the furthest ones away.

The Grow Big says it has trace minerals, so I wasn't expecting a deficiency to show up, if that is indeed what it is.

Any help would be much appreciated, thanks for taking a look :)

Not sure how to post pics, but here is a link.


http://postimg.org/image/xumyk4g75/
 
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