get a microscope app or loupe and turn those leaves over to check for black specks. from now on its always bugs in my opinion. sorry. do @ and put a name in front of and someone will come and help you.
Looks like thrips or some other bug.
Get Spinosad, and spray liberally, according to the instructions.
What are the ingredients?
Deltamethrin 0.0075g/l this is the only one i found on the bottle.
I would look for Captain Jacks as a replacement. Safe for flowering plants, and food safe.
Ok, i will buy. Should i remove the sickleaves?
Save the leaves, unless they’re really yellow. They’ll be okay.