Magnesium or Nitrogen deficiency?

glad it worked out -- useful info -- Mg deficiencies take 30+ days to be visible from the point the problem started. So you need that bump to Mg from day 1 in future.

The Magnesium is the key! I use Epsom salt 2 days ago and now she look better, anyway ty guys! Cheers! GL everyone!

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N doesn't cause interveinal chlorosis. mg is possible, though at 30 days old, could be too soon to even see the symptoms. there isn't sufficient info to give you a specific answer. this is rhetorical: what and how much have you fed of each nute? if you don't know this it's impossible to give anything more than a guess based on physical appearance, which is not discrete. Multiple things potentially cause the same symptoms. There's all sorts of relationships between the nute molecules too.. adding more of one requires ore of another or possibly locks it out etc... if you just dump stuff in and hope for the best, that's also a hindernace to diagnosing anything. just ends up a guess.