Help for a finicky seedling?

[Uncle_Al]

In my humble opinion I see that occur when the soil mix is prematurely fertilized, or a naturally hot mix. I prefer not to feed seedlings until they are larger. If it were me I would soil test and check for levels and pH, if the soil is hot I might flush but at this small size they could still damp off.my intuition says to repot in more neutral mix I am using a product called Sunshine natural and organic, when I purchased it the product was represented as no nutrients added. I soil tested it and it still maxed out the npk test. I added peat and perlite then flushed it prior to repot