I have seen a lot of thrip damage, even with those insanely blurry pics i lean toward thrips. the black spots you saw were likely the shit of thrips. thrips suck, they are not insanely bad like spider mites but they are tough to completely cleanse. Neem, citric acid, Insecticidal soaps. In my fights with them i found a 44 gallon drum filled halfway with clean water, then either dump in enough citric/soap/neem to knock them down. citric may scorch your pistils, I have really only dealt with them in veg and early flower. If they are their in veg, i try to eradicate before flower goes to far. You really do ened better pics. look all on your leaves, tops and bottoms. you will be looking for a little crawler like in my picture. or bigger darker adults. if you thought you had fungus gnats, you could well be seeing adult fliers. Get blue stickies for adult fliers. This is all of course if you can confirm Thrips..