yellow leaves

I suggest you give us a little more info to go by.

Soil or Hydro?

Nutes? Nutrient amounts? What kind of LIGHTS? How close to the plants?

Got pics?


what part of the plant has yellow leaves? Top? Bottom? All over? did they tips get yellow first then the whole leaf yellowed or did the whole leaf start turning yellow at one time?
AND,
Are you in the Vegging Cycle, or Flowering Cycle?
 
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