CFL Grow

Hey everybody I'm brand new to RUI and I'm three weeks into my first grow. I am using fox farms ocean and forest soil in a 5 gallon pot. I just put fertilizer for the first time yesterday( 1/2 tsp ff grow big) and I think I got a little nute burn. I'm running a 4 ft t12 chroma 50 light 5000k and 4 26 wt cfls 6500k in clp reflector lights. My grow room is 2'by4'by7' and I'm about to line it with panda film. Let me know what you guys think. Maybe some input on my nute burnt spots? oh and the strain is Mr. Nice guy... Pics will be added tomorrow because I'm using my iPod and it won't let me drag and drop my pics.

pics the smaller are week 1 and 2 then the rest week three. a pic is included of nute burnt leaf

looking nice, id defo go light on the nutes, isnt fox farm supposed to be a bit hot anyway. other then that ignore the lil spots ive had them happen on my younger leafs and the rest turn out fine.
im along for this