Does my plant look deficient? Whats wrong?

Take a look at the plant in the top left corner. Its my only super silver haze plant and it has alot of curling dark leaves. It is flowering but as you can see the other plants in the room have perky healthy leaves. Could it be a phosphorous deficiency? Im somewhat noobish so if you see this before , please share your 2 cents
Thanks

its hard to say with that picture, go here and check out the picture's and see which one it is
http://www.icmag.com/ic/showthread.php?t=11688
Good luck

Dark green foilage combined with "eagle-claw" or "canoe" like fan leaves usually indicates Nitrogen overdose/toxicity. If you're experiencing rapid growth but the stems seem weak, it's usually a good indication along with the above.

I just resolved this myself however it was in a hydro system so it was a little easier to fix. In soil I would think it would require a repotting in a soil that isn't as hot. Or back off the grow nutes until she recovers. A flush may be in order if the soil has been oversaturated with nutes as well, but I try to avoid this as flushing screws my soil grows up everytime.