@Pera lepak That kind of damage is from a chewing caterpillar or insect (if you didn't accidentally do it?) all of which should be big enough to hand pick without the use of pesticides. If you cannot find it chances are it has moved on.
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I couldn't see it without micro lens, it looks like this (pic where it's white and fluffy)
https://www.growweedeasy.com/cannabis-plant-problems/planthoppers
Thanks buddy and hopefully i'll manage to get rid of them
