Yellow leaves and spotting, Help pls

Hello,

I am rather new to growing and also purchased a Spider Farmer SF4000 for my 4x4 tent. Since then, some leaves are turning yellow and spotting, and the upper new leaves are turning slightly. They also just look sad and droopy.

I did a bit of researched and treated it with CalMag for possible deficiency but I’m not confident and don’t want to kill it. I also figured it’s too close to the light, hence the twisty top leaves, so I moved the light up a bit and ordered more fans.

Thanks for any help, suggestions are really appreciated.