I agree wholeheartedly with Stinky on this one. Those plants look like they're suffering from nutrient burn to me.

If the nutrients that you added aren't instantly soluble in water, then it's really a crap-shoot as to when they'll become available to the roots. Possibly by over-watering, you broke down enough of the fertilizer for it to get absorbed all at once, instead of a gradual release over time. I used the time-release granules and the fert sticks on my first grow, and ended up running into all sorts of nutrient problems. Many of which were misdiagnosed for other ailments.

Get a strong fan inside that room to start circulating air around the plants. Keep it on full blast if you have to, just don't train it directly on the plants themselves. That'll help aide in evening out the soil moisture. Unfortunately, though, should you be looking at nutrient toxicity...there's not much that can be done besides an emergency flush. A lot of times, by the time you notice that the plants have been burned, there's really not a whole lot that can be done to save them.

Worst case scenario: learn from your mistakes, and do better next time. That's how about 99.9% of the cannabis growing community learns how to best care for their plants. I wish ya the best of luck.