Leafs going lighter green

Leafs are starting (slowly) to get light green and even yellow in one of my 4 autos.
Some leafs in the bottom turned totally yellow and were pulled out.

Ph is measured.
I use some comercial nutes and use the recommended measurements (going for the lower side)
Temp and humidity is ok.

I use cloth pots and a pest moss mix. As the peat moss retains quite a lot of water, I water twice a week with aprox 1,5L

Needs more N. It's pulling nutrients out of the lower leaves to compensate for not getting enough. Some of these autoflowers feed real heavy when they are growing fast. Try increasing that ones nutrient dose by half again.

I think it's a magnesium problem.

I've read a follow up of a dude using the same nute brand as me and he had that problem.

The nutes we use (top crop) doesn't have magnesium. It does have N tho.

So I did a foliar and normal feeding of epsom salts.

Hopefully that helps.

These images are from yesterday:
(I did the feeding yesterday)