These tiny little fucks are fungus nats,they live where there is moisture. They eat the little green fungus that grows on your delta cubes and media, if in hydro. Also this is a biggy because the little white larve from their eggs eat ONLY your roots,right off your plant, making them vulnerable to overdose, and other root loss problems. The little fly's,if they find a selfed male-flower will be atracted by the sweet smell,they carry pollen from one plant to another just like sugar ants. Catch the flys with sticky pads on the soil surface,to prevent them from breeding as soon as the emerge from the soil. Get some "Az- Max" this is organic, If you haven't FIM yet,this is the best opportunity to do so. Mix Az- Max at recomended strenght for the drench solution and drench the soil. This stops the larve from eating your roots. They starve and dont emerge from the soil. The side effect of this is slower growth for about a week, continue to water with fresh water. After compleatly dryed out, resume reg nute program. I like to FIM during this time because it slows the plant down for a week afterword,the azmax does this also, might as well get everything that can slow them down, all at once. With your left over Az- Max just put it in a large bowl and mix a little vinager into it.The smell of vinager (rotting fruit) will atract the little basterds to the poison bucket. Within a few hours you will find way more dead nats than on your strip. This method works with some success with vinigar and dish soap. mix the two together in a bowl, The vinigar will attract,the foam will capture,the water will drown. Peace