fruit flies? they look like them...there is no fruit though. there was some a while back that brought a couple flies with it and now its rediculous...the little flies are buzzing all around the substrate...countless flies... do I have to change my substrate?...its fresh too I just put it in a week or two ago and its the same stuff as I had before. I'm thinking about getting a sticky trap and putting it outside the enclosure. idk what to do.