Help diagnosing seedling issues.

[WhippoorwillG]

I have never experienced the issues a friend of mine is having with her tomato seedlings. I helped her get them planted and started, but something has gone severely wrong.

They were planted in a coir seed starting mix (which I have never used before) and topped with vermiculite. They are inside and under fluorescent lamps. They looked great at first, but started showing a range of issues from intense gold/brown cotyledons, brown necrotic splotches on the leaves, and a range of unhealthy colors.

First fertilize was not applies until first true leaves started to appear (at that time, the issues were already manifesting).

Thoughts?

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