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Hi, every body!

can you please tell me what happened to my seedlings? what is that orange signs on the top of the seedlings?
and why the new spines disappeared? Sorry for my bad English! thank you in advance.

It appears to be viral or fungal in origin. I honestly don't know the best course of action. You could separate them from the rest of the unaffected seedlings. They might be able to fight the infection off, but then again they may not.

Dear George
Thanks for your reply. As far as I remember, I have used some blue fertilizer about one month ago for watering my seedlings.
Is it possible that these effects caused by the fertilizer?

Fertiliser might cause damage, but it probably wouldn't be limited to where those brown spots are. This is more likely to be a random infection from high humidity and bad luck. At this stage, you should try and give it more ventilation.

The top of the plant has been damaged, maybe even completely killed, so you might end up with pups when it starts growing again. Or it might just carry on growing with a slightly disfigured section.