fungus gnats - next level assistance

[mrphilips]

i have a tiny fly problem in my house... and in my orchids.

i am 95% sure they are fungus gnats.
tiny black-ish flies, like fruit flies or gnats. i see them hovering around all my potted plants. i got them from a money-tree someone gave me as a present (thanks - you know who you are).

lesson one learned - quarantine your plants before letting them play with the others, now lots of them have it.

they seem to prefer the moss and bark-chip potted plants more than say the sandy aloes or even the "general" soil plants. specifically, they have honed in on my orchids.

i have tried to go natural - cinnamon sprinkled on top and watering them with chamomile tea - kill the fungus, starve the gnat. but... they persist. it has been three months and many doses of both, no luck.

problems i am having deciding on a solution:

a) the chemical alternatives are a bit confusing - not really sure which product i should get by name based on what i'm trying to kill and what i don't want to kill...

b) will this kill my orchids? what i have:
2 phals potted in bark,
1 phal in moss (i just haven't re-potted it after getting it)
1 paph in bark
1 phrag in moss
1 brassidium in moss (also to be re-potted in moss/bark)
1 encyclia (clinging to a stick - unaffected thus far)

any suggestions on a level-two approach?
should i go chemical?
what name-brand choice do i make?