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Its over heated, doubt its over ferted, cause if it was it'd have yellowing or necro of the leaves.

From the pics, my first guess would be they have been over-watered and possibly although unlikely over-fed (no yellowing of the tips). Check out one of my grow sources.
http://weedfarmer.com/cannabis/
http://weedfarmer.com/cannabis/tables_guide.php
http://weedfarmer.com/cannabis/plant_abuse_guide.php
http://weedfarmer.com/cannabis/mistakes_guide.php

In the last link, IMO, the worst mistake a grower can make, all things considered, is #2.