They're not terribly bad for your plants. More of an annoyance but also an indicator that something is too wet. Check for excess moisture somewhere in your grow environment.

I use those yellow sticky insect catcher thingies. Set one on your pot rim and the gnats will be gone pretty quickly.

PC :smokin:
PharmaCan Reviewed by PharmaCan on . little black bugs? Indoor setup. I have a bug problem but i dont know what they are. the bugs are too small to take a picture but i will describe them. They are black, .2 cm long, if you look at the cm side of the ruler and look at the tiny lines...thats the size of em. Can you tell what it is? Rating: 5