Can you please help me diagnose this?

Hello everyone, thanks forgiving me a hand with this. I am a first time grower and i have not yet developed this skills to diagnose problems in my plants.

There are some yellowish areas on the plant, From what i investigated nutrient burn will show on the tip and edges of the leave so i guess its not that. Anyway, im attaching a photo so you can check whats going on. Here are a list of my specs too:

What strain is it? Royal Gorilla

Is it in Veg or Flower stage? Veg

If in Veg, for how long? Begining of 3rd week

Indoor or outdoor? Indoor

Soil, Soilless or Hydro? Soil

If soil/soilless, what is in your mix? Advanced Nutrients Micro, grow, bloom at 1/3 of recomended dose.

If soil/soilless, what size pot? Still in 1 liter Plastic pot

Size of grow space (LxWxH)? 80 x80 x 160

Make and model of grow light? Mars Hydro ts1000

Temperature in the environment? Around 26 celcius

Humidity in the environment? Around 60

PH of medium or reservoir? Advanced nutrients says its PH perfect

Thanks again for any advice!