It sounds exactly like white flies to me...
They jump striaght up in the air when they see you and they live in the substrate...
"White flies:
They look just like tiny moths, and lay eggs on leaves and or top of the soil. They are a pest in big numbers and are not very hard to get rid of, they can cause damage by sucking sap from the plants. Here are some ways NOT to get them: Do not overwater your potted plants. Allow the soil to dry between waterings and provide good drainage. Another one is to put sticky traps up when you think you may have them, that way when they get stuck you can identify them.
if you already have white flys, you can use insecticidal soap, this will help stop them from flying so it wont infect other plants.
It also stops them from laying new eggs. If you use the soap reapply weekly.
If insecticidal soap does not work too well, there is some other options that are stronger called PERMETHRIN dust, Which can be used during flowering and is safe on ediable plants.
Here are some other good things to use to rid of white flys: PERMETHRIN and biffen (both are safe to use on ediable plants),
Spreader sticker ( hich allows to apply the spray to a wider area)
Nylar ( works well for inhibiting there growth and development)ORTHENE FOGGERS works well for a small area and are safe on the plants.Other poducts you can try are:
Chemicals
Hot Pepper Wax,Safer Yard & Garden Insecticide (which can be used right to the day of harvest),GNATROL( used in hydro in the water as well as soil),Doc's Neem Pest Soap,Safer Sticky Stakes,TR-11000 Pyrethrum."
If they end up being white flies:
pour a half inch layer of sand on top and put some cups of beer in the room they will go to the beer and drowned and the eggs they lay in the substrate won't be able to hatch and get out so you kill the growth cycle....