Leaf issues from week 1

My plants are 13 days old growing in a DWC system. One of the lower leaves has 2 yellow spots on it. PH is at 6 and i drained 2 gallons of water out yesterday and added 2 gallons of fresh water. They still have have some nutrients and amimo acid left over from the week 1 feeding.Should i be concerned


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Answer these simple questions the best you can.
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Strain; Type, Bag seed, ILGM… name of strain:

How many plants:

Age from Sprout and Flower:

Soil in pots, Hydroponic, or Coco / Brand and type of Soil & Size of Pots:

How often do you water and how do you determine when to do so?

PH of water and runoff or solution in reservoir:

What is strength of nutrient mix? EC, or TDS:

Indoor or Outdoor:

Light system, size and height from plants:

Temps; Day, Night:

Humidity; Day, Night:

Ventilation system; Yes, No, Size:

AC, Humidifier, De-humidifier:

Co2; Yes, No:

Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but short, to the point questions and facts will help us help you

Also here is a Deficiencies & Excesses Chart to help you identify what is wrong with your plants