Is this a Cal-Mag issue?

Hi all! My Cherry Cola auto flower is about 6 weeks old and has developed this yellowing on the leaves. It seems to me that it needs some Cal-Mag, but I would greatly appreciate some other opinions so I can get her back on track. Thank you!

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@JBL this looks like a manganese deficiency. Yellowing at the tips moving in and scorch marks/burn spots. Areas surrounding yellowing still dark green.