hi ive just set up my 1st ever grow and i'm already having problems well its just 1 problem for now but anyway here it is ive got my seeds germinated and put them under my light im using a hydroponics system which is running nice ive got a 250 watt HPS light running and got some nutrients ready to use when they are 2 weeks old however my grow room is a back garden shed the temperature is fine but already ive noticed small flies in the room they arent so small that they are microscopic they are like a midgie size fly or green fly im just wondering if at this time of year they will be plant affecting pests or just predatory pests as an uneducated guess i would say most of the crop affecting pests would be in hybernation this late in the year but as this is my 1st grow i dont want to take any chances i appreciate any help and advice given and all comments are welcome even if its to diss me on my newbie uneducated approach i have my room coated in mylar and is as sealed in as an outdoor shed can be i have an intake and outake airflow syestem that has a webbing type film allowing air in/out but no bugs but the little ***** still find a way in (sorry for the ramble...)