Need a little background. Great pics, but need some information.
How old are these plants?
How big?
What are you feeding?
How often?
How much?
RO Water or Tap water?
My initial reaction is to suspect 2 things going on here, which always opens the door for a possible third problem. It looks like you have a little nutrient burn going on...let's start with that. Need more info about their feeding to determine what else may or may not be wrong.