Other then the coloring the plant has been growing fine. Just wanna make sure it’s nothing serious.
It kind of looks like this, may the following link will help.
Iron Deficiency
by Nebula Haze & Sirius Fourside
Problem: A cannabis iron deficiency is usually seen first on bright yellow new leaves, and the symptoms of a cannabis iron deficiency can sometimes appear alongside other cannabis nutrient problems or deficiencies. An iron deficiency is usually caused by problems with pH, though sometimes a cannabis iron deficiency can be triggered by a stressful environment and may clear up on its own after the period of stress is over.
Edit: Unapproved link
It is likely a magnesium deficiency. Copy and paste this support ticket and answer each question. It’ll help us figure out what’s going on and how to fix it.
fill out this support ticket:
Strain; Type, Bag Seed, Or Na
Soil In Pots, Hydroponic, Or Coco?
System Type?
pH and ppm Of Runoff Or Solution In Reservoir?
What Is Strength Of Nutrient Mix? Ec, Or Tds
Indoor Or Outdoor
Light System, Size?
Temps; Day, Night
Humidity; Day, Night
Ventilation System; Yes, No, Size
Ac, Humidifier, De-humidifier,
Co2; Yes, No
Feel free to add any other information you think is pertinent.
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If you turn off the blurple and take a picture so we can see the true color of the plants. It will help a lot.
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we need some information first 
Yes, please fill out a ticket. Since it’s worse on the upper leaves, that means it’s an immobile nutrient problem. Most likely Iron. but if you’re in soil, a good Micro Builder would be beneficial.
However, I tell everyone, before you chase nutrient deficiencies, check the ph of your soil (requires a soil slurry test - you can google it).
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