From my perspective, the problems comes from the depth of soil and plastic tray. I do not know how much nutrients did you add in soil, but seem like it is not a main problem. I think you can buy seed in another store then sowing again in the different tray to check the quanlity of seed.
Spring onion is so great, I think this is time for you to harvest and let another one come out again for the next harvest. :D
Thank for sharing @greddyforce .
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I bought the soil from a store and it is for planting seeds so I think it already has all the necessary nutrients.
Last year I used a different seed but sunflower turned out the same. Maybe sunflower only wants to grow outdoors. My plan is to replant them outside when nights are warm enough.
Good luck for the next time, @greddyforce and keep letting us know the result. I also want to learn as well as know the reason to cause that issue. Thank you!
Thanks! I will be making another update post sometime in the coming weeks.