Auto is showing signs of deficiency, what is it?!?

I have a watermelon zumzum sativa auto about 7 weeks old and I just transplanted them about 1 week ago from a 3gal to 7gal. I used fox farm ocean forest as the medium. when I transplanted the roots and ball looked really good. Would really appreciate any help i’m bad at determining what nutes I should use. thank you!!

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Looks like it could be nutrient burn. Can we get a pic in natural light? It kind of looks like mine. I burnt my strawberry cough by accident. It looks similar but I could be wrong.