What is going on with my auto flower

[Sonu1990]

Fox farm soil. Fed cal mag with fox farm trio.
Flowering for one week now.

Why are the leaves yellow? Should I defoliate?

Video is 20 seconds

 

[BB22]

Just a guess, and I’m a new grower.

Maybe nutrient water that splashed on the lower leaves? I wouldn’t worry about it.

 

[Imzzaudae]

Can you please take a couple of still close up pictures. The rusty blotches on lower leaves. Any leaves not nice and green.
Post them so I can have a better look at your plant. A nice overall plant shot.

What light are you using. What power setting, how high above the top of the plant.
How much much of the trio? How much Cal-mag, anything else?