Welcome to AFN. We're going to need a lot more information in order to help you.
What soil are you using?
What nutrients are you feeding, at what strength, and how often?
What is the pH of your feeds and the pH of your run off, the water that runs out the bottom of the pot when you feed them.
What is the temperature and relative humidity inside your grow area?
That should get us started. Judging from your pictures it looks like you may be in a pH lockout situation. Your pH is likely off and it's preventing the plant from uptaking nutrients properly.