Oh dear jr, you have disobeyed one of the basics regarding new plants you have bought from a nursery/garden centre. When you get them home, keep them in conditions they enjoy, but isolated fom your main greenhouse.
I have to admit, I learned this the hard way, having been to a fuchsia nursery and bought several plants, took them straight into the greenhouse, and within a few days the little white b***ers were flying all over the place.
I agree with quizzical that, from your description, they do not sound like whitefly.
If you've got a whitefly infection, when you brush the leaves of the plants they fly up in a bit of a cloud.
Hope what you have 'acquired' is nothing serious, but like me, you'll know what to do next time!!
valmarg