1 of my healthy plants turned brown yesterday and. overnight

A customer has a question and I hope we can get some opinions on it, thanks

Coincidentally 1 of my healthy plants turned brown yesterday and. overnight.
I have included a pic of 2 plants for comparison.
No idea why have been treated exactly the same?
Any thoughts?

ILGM.Admin-USDA Certified Grower
Feb '15
COPY/PASTE: This “Support Ticket” into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so = NA

Strain; Type, Bag seed, or NA

Soil in pots, Hydroponic, or Coco?
System type?

PH of runoff or solution in reservoir?

What is strength of nutrient mix? EC, or TDS

Indoor or Outdoor
Light system, size?

Temps; Day, Night

Humidity; Day, Night

Ventilation system; Yes, No, Size

AC, Humidifier, De-humidifier,

Co2; Yes, No

Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but short, to the point questions and facts will help us help you smile

I copied this from another page hope it helps welcome to the forum good luck

This is a support ticket. We need more info to help

Did it get obscenely hot yesterday or anything?

Or did you feed her? Looks like she got severely burnt up

Something changed…1—put 5-------1.5" triangular drain holes in the bottom edge.

betcha the sick plant drowned the roots.