Thanks, that was my first thought but was not sure, that’s why the questionmark and opening a thread. I haven’t splashed or sprayed nothing, I water in the morning and directly in the soil. It is a tent inside a room in a second flat, so out of indoors, no window open, no bugs (just some fungus gnats but not enough to worry about 
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Thanks for the help, I have sprayed with Canna Cure (if there’s no bug at least as IPM), I will see if the damage expands or not … 