Whats up with my leaves ?

Hey guys I’m sharing with you my photoperiod seedlings.its been exactly a month since those have been buried in a canna terra seed mix under a 50w led projector when i can i take them outside we have a nice sun. its about time ti burry them outdoors , but my first true leaves are turning yellow but the rest are fine ? one of them also have some spotsI am worried about spider mites .. ive fen them first yesterday with flora nova series 1/4 of the solution recommended..
if someone can have a look and spot the problem i will be very thankful !!

Lack of nutrition.

TreeFarmerCharlie said:

Lack of nutrition.

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But some of the leafs look burned on their tip like a nute burn .. i was afraid that i didnt mix the seed mix with normal soil and it became verry hot and its burning them ?

The leaves all look pretty pale to me, and the "burned" leaves look more like the leaves were depleted of nutrients to feed the new growth, and are now dying off.

TreeFarmerCharlie said:

The leaves all look pretty pale to me, and the "burned" leaves look more like the leaves were depleted of nutrients to feed the new growth, and are now dying off.

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Thank uou for the enlightenment mate i will feed them again as soon as the soil dries a bit.

Update ! They look amazing even the smallest one healed up, i got only one that is in between life and deth i hope when i take them outside the good ol natural weather will make the dream work