Discoloration on leaves

Have this strain called coffee cookies. I just got done growing a couple months ago and didn't have any discoloration on the leaves. This grow is a little different, I am seeing what looks to be like "rust" if you will? I'll post a couple pictures but was hoping to see if anyone has any idea if this is a deficiency or too much of something?

Looks like mag def but without details or whole plant pics it’s hard to say for sure.