Orange spots on leaves at 1 inch tall

A question from a fellow grower:

“I’m having trouble with the seeds I purchased from you. I start them in rockwool and they sprout within 48 hours. They get about an inch tall grow their first true leaves. Then they start to get orange spots on the leaves and they curl and dye. I have them in a grow tent with a LED grow light on them. I have a circulating fan. And my temperature is 75 degrees in the 10 with about 50% humidity. This is the third time I’ve tried and they keep dying by the same way. Attached is a picture. The colors are off because of the LED grow light but those spots on the leaves are orangish. Please help me figure out what is wrong.”