Thank you all very much for all the suggested solutions. Truth is, I blew on the leaves before taking the pics bcs there were tiny black dots here and there. There was also a little white thing on one leaf... No webbings or nothing underneath the leaves tho!
My man Cosmic_haze, only fellow grower on here to have grown this APG strain, tells me it's leaf septoria due to bad genetics.
I think I might be dealing with a combo of LS and the beginning of a SM infection. SM love a warm dry environment and it's exactly what Ive provided my baby with at night.
Next course of action for me : get some lady bugs, get a spray bottle and some neem oil or potassium soap, make sure the environment is better ventilated at night (SM hate a well ventilated area apparently) by having a small ventilator blow gently at my baby and last but not least, get myself a microscope so I can have a better view of whats going on!
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