well,
your conditions are to humid
you are having powedery mildew
so your grow has an imbalnce. try to get some theorethics about growconditions, and try to come to optimal
there are several sites and books to learn
your black bugs are mostly not thrips but fungus gnats.
in this stage of your grow there is no sense to fight anything,
for the next grow be prepared
there are nematodes , that work as predators,
Miss Weed will have more lessons for you .
every grow has its lessons, feel ready to learn
greetings