Insect and Spider Identification: CLOSED: Weird flying insects on my plant..., 1 by RazorSharpFang

RazorSharpFang wrote:
I'm trying to grow a tree in a pot for sale in a charity event that's coming up soon, but I've noticed these weird flying insects all over my plant.
See attached photo.
Are these good insects or bad insects? The tree in question is a Cape Leeuwin Wattle (Paraserianthes lophantha). I'm worried that these insects may be harmful to the plant, and I would not be able to sell an insect-infested plant in good conscience.
If these insects are bad insects, what kind of steps could I take to rid the plant of these? I'm worried that these may be adult aphids, for my plant does have an aphid problem I also need to take care of.

Thanks in advance.