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Need more info to help you, mainly soil, water, pH, info and if you are using nutrients.
Filling out this entire support ticket will help the most though.
COPY/PASTE the below list into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so; Or post
NA (non applicable)
-What strain, Seed bank, or bag seed (photo or auto)
-Age of plant
-Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
-Vessels: Type and capacity of container (fabric, plastic, etc)
-PH and TDS of Water, Solution, runoff (if Applicable)
-PPM/TDS or EC of nutrient solution if applicable
-Method used to measure PH and TDS
-Indoor or Outdoor if indoor, size of grow space
-Light system List brand and wattage/spectrum
-Actual wattage draw of lights
-Current Light Schedule
-Temps; Day, Night
-Humidity; Day, Night
-Ventilation system; Yes, No, Size
-AC, Humidifier, De-humidifier,
-Co2; Yes, No
If growing Hydro some additional questions:
-DWC? RDWC? Autopots? Ebb and Flow? Other?
-Distance of liquid below net pot (DWC)
-Temperature of reservoir
-TDS of nutrient solution
-Amount of air to solution
Always try to upload a clear picture in white light of any issues you may have
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- Indoor or outdoor? - size of grow?
- Otigin of seeds?
- Regular, feminized, or autoflower?
- Origin of water. PH, EC/TDS of source water?
- PH and TDS/EC of if mixed solution?
- Grow method? Soil, Soil-less, Coco, Hydro, Aquaponics. Please explain.
- Nutrients or fertilizer system used.
- What typr of lighting are you using? LED, HID (MH, CMH, HPS), or Fluorescents? Please elaborate.
- What are the temps in your growspce? Day / Night?
- What is the RH = relative humidity in your growspace? Day / Night?
- AC, Humidifier, De-humidifier?
- Do you have a Ventilation system? Size? 4", 6"?
- Co2 Yes / No?
- How long have you been growing?
- What budget have you set in order to grow successfully?
- If you grow hydro, then please explain your hydro method. DWC, R-DWC, Ebb and Flow, Or; Other? Other?
Welcome to the community ! Support ticket on this one Will definitely be a big help For growers to help you. 
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Are you using cannabis friendly soil ? How many weeks old are the plants. Have you checked PPM Run off Also PH ?
The new growth looks healthier than your dark green old growth imo
Probably caused by soil, can’t know without details though.
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