sounds like you have fungus gnats...the only thing i found that works on them is azatrol...it is the active ingredient in neem and is concentrated but it will take 3 -4 weeks of using this to break the breeding cycle....the azatrol makes the new hatchlings sterile so they cannot reproduce but it is important to keep the regim up until they are gone.....overwatering is usually the cause of infestation...they do not do as well in soil the gets dried out a little...my suggestion is during veg don't water until you see a little droop in the plants and with the combination of the 2...lesss water and azatrol that is about the only way i know to get rid of those pesky little shits:thumbsup: