Beginner Gardening: Indoor tomato seedling w/ yellow blotches?, 1 by amazing_one

amazing_one wrote:
Hello All,

My tomato seedlings are about 6 weeks old. I started the seeds with MG potting soil in jiffy pots. I use the Jump Start Growing light raised about 6 inches above the plants. A few days ago I noticed one plant which was growing nicely is slightly wilting with some yellowing appearing around the edges and leaves appear blotchy. I am not sure if this a sign of a certain deficiency or from under/over watering? All my other tomato plants look fine.

Can someone identify what the problem may be? I would hate to see it completely wilt and die.