I would just plant them out and hope for the best. Was the seedling soil properly sterilized? Were the leaves touching the light bulbs?

I used the Jiffy seed starting mix. I do not think it was sterilized, but my other plants are doing great. The leaves are not touching the bulbs too. Currently, like you, I am planning on planting them out and hoping they grow!

The new growth in the middle looks good, so it might survive. Seems the plants should be bigger at 4-5 weeks. I started seeds on 1/5, and my plants are over a foot tall. Trim the bad leaves and hope for the best. Be careful with fertilizer on seedlings. 1/4 strength.

My tomato seedlings are three weeks in, also at 70F, and a few inches high. Height of these seems about right. Maybe just a bit small. They grow a lot faster if it is warmer. Usually I try to hit 80F.

My point about sterilized soil was that the soil might contain diseases that are more or less specific to tomatoes. Commercial soil mix is probably pretty sterile, however.

last year I used fish emulsion on my tomatoes all of them started to wither then at the bottom where the plant came out of the soil they completely dried out and died. I may have used too much but I will never use it on my tomatoes again

Just a thought. You could check the list of ingredients on the Jiffy seed starting mix. I recently read that coir can contain a lot of salt, which would be bad for seedlings. Usually it is flushed/buffered, but who knows? A couple of years ago I had major problems with my seedlings, and I eventually noticed salt crystals on the surface of the potting mix.

I am planning on planting them outside next week. Chance of frost is very low in North Texas now. I do not have spares, but it won't be a big deal if I do end of losing these plants. The Sungold and SS100 plants (which are growing fine in the same conditions) grow so fast, I can easily replace the sicky Celebrities later. Also, rhoder, I really like your idea of using boiling water for the seed starting mix. I will try that next time I start seeds!

I think Celebrity is a popular one for sale at nurseries - in my area, at least. Usually one of the earliest to be offered for sale. You can probably easily get another plant if the other one tanks. Hope you have a good tomato season!

eta: I learned the boiling water trick on this forum...

Thank you for all the input and ideas everyone!