Bug Question..

Today I checked my plants and noticed what to be like flies or some shit, is this a bad thing?

yes it is ..............

my grow tent is outside and when it would rain some how flies and other bugs would go in I posted the same thing
and they recomemded me to use a Pyrethrum spray
some brands they told me are
Garden Safe or
Safer Brand spray

u can find it at a local home depot

look at my post if u can find it i need help with bugs too