Is this Heat Stress or Nitrogen Toxicity?

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My plants are just starting there 4th week and yesterday I noticed the leaves look funky..I have them in mostly Fox Farm Happy Frog but 3 days ago I added about 1 inch of Ocean Forest just on top and spread around. The white pistols just started showing 2 days ago so I switched from my 400w MH over to my HPS bulb. The light is about 2 feet away from the tops and Def not over watered. In fact I haven't really Givin them any notes at all but was wondering if this is just heat stress or nitrogen toxicity from too hot of soil?? Should I flush real good?? I have moved light up alittle..also I took pic of my temp/humidity meter inside the tent and while lights are on is pretty consistent and can't get Temps to lower 20160717_200507.jpg 20160717_200554.jpg 20160717_200514.jpg
 
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