The canopy did this over night no idea what happened…Is this possible over feeding or mold on the canopy leaves?? The strain is frog holler haze
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Looks more like your temp then anything to me. A little nute def but nothing bad for that stage of flowering what are you 4 weeks in? How long do you have left? What are you feeding it? What soil? What fans and ventilation? If you wanna get something to keep this problem away go to your local feed store and ask for a bag of kelp meal. They usualy sell 50lb bags for like 60 or 70 bucks. Thats all youll need as “nutes” untill you wanna pimp out your grow more:)
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Looks like possible Phosphorus and/or potassium deficiency. May be light burn. How close are your lights?
It’s best to hang a cfl bulb over the plant then take a photo. It’s hard to see the problem with the yellow light. If all that came about over night its most likely nute burn or high temperature.
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Maybe fungus spots from over-watering or burn in high humidity conditions. Looks like outdoors after longer period of too humid weather. Picture with real colors should tell more. But looks like the rest of plant is healthy. I would try If it shows again after putting away damaged leaves.
I’d say what you got there is some nute/heat burn. Excess heat at the top of the plant is causing the leaves there to exhibit the nute burn first. Brown tips lower down show that there is slight burn happening, not enough to cause real problems, but the excess heat at the top is causing those leaves closest to the light and radiant heat to crisp up.
Toxic salts buildup is very common later in flowering. I manage to do it quite often. 
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