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.

neither, its a fat ass aphid. and looks to have a clone beside it. Aphids will reproduce by cloning themselves via live birth and can populate in numbers really fast. The main downside to them is the damage they cause by biting and draining the plants fluids. but also their excrement"honeydew" is much like sugar water and can encourage molds/fungi and such to grow or attracts other pests to eat their sweet drippings. They come in many sizes and colours, from green, brown, red, yellow, black and even white. I'm sure their might be more but they have a lot of colours. www.youtube.com/watch Best to kill them all off, soapy solution, sit for 5 min + a jet of water will do just fine.

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.