Orangeish bownish edges on new growth leaves, HELP

Plant is about 5 weeks old and is a clone. 400W MH bulb and the top is roughly 8 inches from the plant. anyone know why the edges of the new growth have orange??????? Any input is appreciated
 
60% miracle grow 40% organic nutrient free soil a 2 gal pot and it is quite warm but not really too uncomfortable.. but maybe my baby is sensitive. i moved it down about 4-5 inches im going to see how it does from that...
 
a lot of miracle grow is time release nutrients, it may be too hot for your plant. Hard to say for sure without a pic. What's your Ph at?
 
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