Flowering stage problems, indoor growing - Bottom leave with orange/yellowish dots

[Borjaazul]

Hello everyone, very happy to share my first post.
So we have a small problem, we think it's lack of Mg, the plant is being cultivated in soil mixed with 20-30% worm castings. Could anyone verify it?
Thank you so much!!
PD: Attached are the pics

 

[Gluteous]

Kinda droopy looking. Overwatering? See anything underneath on those yellowing spots?

 

[Borjaazul]

It ended up being a Mg and K deficiency I got to solve it but now I have another issue (last stages of flowering)