They probably are thripes, the flies look sorta off white, They are sap suckers, What they leave looks like little snail trails, like they went along scooping the surface. They can be controlled with ladybugs, cali -clean even seems to kill them. Check the thread pretty cool chit man. CAli clean, has some healling propertys as well, I've sprayed the remainder of a butch on a yellow undernurished plant in hours it was greening up. Pick up about 5 good size habeneros and follow the instructions, take about 20 min to simmer it down. presto, best spidermite/bug/ bandaid there is for your plant, put this on any injured leaf you want to keep. now its lunch having SPAGHETTI.