Yellow spots on big bottom fan leaves

[Jaden4306]

UPDATE - looking much better after feeding with some nutrients. Cut a couple leaves too for air flow...

[Jaden4306]

I'm going to transplant into a 5 gallon fabric pot at the end of the week...

[Jaden4306]

I used a hot soil and haven't added nutes because the runoff PPM was high. Yesterday was the first feed with nutes. I watered with a gallon of water

[Jaden4306]

Watering every 4 days when the pot is light and the soil is pretty dry

[Jaden4306]

I looked under the leaves quickly and didn't see anything but I'm going to check better. I also watered with tap water the last 2 watering so tomorrow...

[Jaden4306]

Can anyone tell me what these little yellow spots could be and if there's something I need to do to fix it. She's 42 days old from seed and she's been...