nitrogen defieceny??? pics

my plants cotlyedons died already and i feel like i could have stopped this i read that this is nitrogen defiency so im asking you guys my bootom 2 true leaves are turning yellow and this is on my biggest baby o please helppp

It doesn't look too bad at the moment. Add nutes the next time you water and see how it does over the next couple of days. If it starts turning more yellow, you're probably overwatering. But if it is N deficiency, it should be cleared up by the time you have to water again. (The yellow leaves will stay yellow/die so just trim them)

the first 2 leaves dont matter. they are destined to die anyways.

is there a nitrogen deficiency occurring? yes. up the nitrogen and micro nutes and youll be ok.

what soil are you using and have you added nutes yet, i agree with both comments from the other guys, nitrogen def yes, but why. if you have been adding nutes then it could be over watering. have you got good drainage in that pot? also how are you deliberating if the plant needs watering, can you lift the "pot" or are you using a moisture meter. its just it looks like if you tried to lift that then you could damage the roots with the soil breaking up, if you know what i mean.

im using fox farm ocan forest and its day 22 and i just started using nutes today so i guess i shoulda started adding nutes earlier and i just tell when its dry i saw a youtube video on jorge cervantes and he said if you put ur finger in an inch and a half and its dry then water but the plants jst got rained on so i havent been able to water with nutes cuz i dont wanna over water but i added nutes and water anyway so i think i did over water but i rather over water than have dammage to the leaves so ima just not water for a couple days like 5 and see what happens.
and there water gallons and i cut 5 holes in the bottom so yea they have good drainage. and the only nutes i have is gh floraduo cuz the hydroponic store by my house gave me quarts for free of the A & B so im using that til it goes out and i dont have anything for micro nutes...:/ but i am gonna go with bio thrive from gh and i think ima get grow and bloom should i get the micro nute?