Plants are 33 days old. I keep them under a grow light at 77 F with a fan on them. I took them outside for a day it was about 90 f outside and one day later this happened. I used ferts on them about a week ago. I dont water until they are dry at least an inch down. Please tell me what I'm doing wrong. Is it nutrient burn? From the hot sun? Over watering?
kinda looks like sun spots, but it could be chemical burn. What type of lights and chemicals are you using and in what dosages?
its best to just leave plants in the environment you created for them, id say you probably just toasted the plants bringing them outside. Dont worry about it.