You need to narrow it down and tell us some info about your grow and post some pics... if we cant see the plant we cant diagnose what's wrong.
i will send better photos its about purple haze with 2 weeks alive !i have nutrients for grow and flowerins period but i have stop at grow when i change the soil and maybe break some roots ...oops i use lamp 250w but i havent use yet cauce it stops ....the leaves go yellw and after like burned i use fromm nutrients only rootbastic and ph down at water basic ph 7