Rust colored spots?

My 2 autos started showing a couple rust colored spots on a couple leaves, not too bad but definitely concerning me. Any help would be appreciated! The only thing that I can think of is I did give them a slight foliar misting and left lights on, and my lights were pretty close, possibly a minor burn?

What are you doing for Ca?

Yeah I could be mistaken but I think rust spots are a calcium deficiency but I can’t remember and also don’t know that much

CannaCountry said:

What are you doing for Ca?

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I'm using calmag plus in recommended amount, just watered yesterday with calmag in there along with a toned down dosage of FF grow big