Deficit or excess? Or what

Hey buddy have you watered the plants with molasses or recharge or compost tea, or similar things recently? I have found that if those things get on the plants they leave a sort of coloration behind after the water they were in dries up. The top of the plant looks perfectly healthy. I honestly think its probably staining from watering with some type of thing that can stain. Your temps and humidity look great. The rest of the plants look great. If you haven't watered with recharge, molasses, compost tea, etc., then I would say that we need some more info. What's the PH of your water and your medium? Have the pots been hit or otherwise sustained shock in the past couple days? Again, it looks like staining. If not, it could also be other things like wind damage.