Originally Posted by stinkyattic
That type of pot has very poor drainage- the built in drip tray makes the holes in the bottom nearly useless. If you can take it off, and even add more holes, that would help.
You have a micronutrient deficiency or lockout. It could be pH or overwatering, or there may be something in your tap water that is making your plants miserable. Do you know the hardness of it? Does it taste okay, or does it stink like pool water? Yup, your pH is too high- get your fertilizer solution down to 6.5 so the runoff comes out lower, and also be careful not to overwater your plants.
If you have a micronutrient supplement, I'd mix up a weak solution of that and use it as a foliar spray to correct the deficiency. If not, you can use your FF Grow Big, mixed at ~1/4 what the bottle says, and mist that on your plants lightly. The primary deficiency I see is Magnesium. A pinch of Epsom Salts in your spray bottle will help that. The plants are definitely old enough for food, but until you get your pH sorted out, I'd foliar feed gently to keep the deficiencies from spreading.
More questions to nail down the cause:
What soil were they in before?
What size pots?
How long ago did you transplant them?
Were they showing symptoms before the transplant?