What is this bug?

I think it's just a bug in a tent. I always get bits of plants eaten and never see them. Add silica or something that helps the plant There are a lot of holes. So a few sticky traps should help catch them. Also depending if you see any babies running around on top of your soil. You need to deal with the whole chain. Larva, babies and full grown all at once. Kill the cycle. Close up your tent more. Or the area you grow with Light in dark room and plants smell attracts all life in said room

A fat aphid and a few babies. If these are the only ones on the plant, you can simply squish them with your fingers. If left alone they can get out of hand really fast, but not one of the worst pests to get. Scout your plants closely, I would advise against spraying anything on your plant while it's in flower. You often cause more issues than the bugs that way.

Spider mites are tiny, could fit on the tip of a pen. is not a mealybug either.

Looks like an aphid to me. I'm used to seeing green ones though. I didn't know they were brown too.