The twisting and curling of the leaves and those random yellow spots/streaks,would lead me to think PH
what is your PH
Also looks like you have spider mite damage
Put up more info
Like ph
Room temp/humidity
Feed sched
Etc...
As Highpotanoose mentioned, more info would be helpful. I also noticed what looks like pest damage (probably spider mites). It could be a pH issue, as there are many spots with it (or that's what it looks like). I'd take care of the pests and make sure your pH is in range.