Are you sure they are not fungus knats?? That is certainly what they sound like What makes you think they are fruit flies??? Me I would get rid of any flying things near my grow as
@ChitownCannaChica has already suggested
Athena ipm is really good to treat fungus knats and anything like that and sticky traps as they will definitely hurt your grow
Have a read on the help pages about fungus knats and causes and how to prevent them.
I hope you manage to get it sorted 🙏