There is some white thing on it

if it does not remove and its not fuzzy, its not WPM. I also don't know if its a potassium deficiency if the tips are curling up. thought that's an excess thing might be wrong though. This is your one image zoomed in, look at the circles, they have thrips in them. https://ibb.co/VDLrWgL This pic will expire in 2 weeks from today. They are small and yellow with a even smaller brown stripe that are little dumb wings, if you look closely with the naked eye assuming you don't have bad eyes you can see them. They like to be in the canal of the leaf. Use BTi, its safe in flower or get some predator mites in there asap. IMO BTi is a better pick its good for mass infestations.