leaf discoloration...

Yellowing on leaf to the left..
Also on leaf to the right some wierd dark spots, its color makes it look like its rotting, almost like when you leave out a salad and it starts to get dark and slimy looking

Looks OK to me.

dose not look real bad, maybe could use a little more nitrogen but I would not swet it..

I just cut off the leaf to the right because it got worse, it looks worse in person than it does in the picture (which is making it look more bright green than it is)
My nutes are under 300ppm and the pH is at around 6... not quite sure what could be causing the leaves to look like they are rotting from the middle