Quote Originally Posted by busybee
"I WATER AND FEED THEM EVERY OTHER DAY" surely thats severe nute burn,are you sure it happened so quickly?
Doesn't seem to be the case since the others are fine... though I'm very surprised the other three still look healthy. It's definitely too much feeding.

Vancefish idea seems pretty viable, that would make a lot of sense. are there any differences in the soils of this plant and the others? could some nutrient have accidentally spilled into the soil? has that plant been in its current pot longer than the others? how long? How is your ingoing/runoff ph?

You should probably just fill out the troubleshooting form like martyrprojekt said, a lot of info is necessary for this one...