Hi, if you move them near any other plants they will be affected as well.
Personally, I would say the girls look ok, but mine did as well, but final yield was definitely down on usual, plus having any pest in your grow just helps to spoil the moment.
I would put a yellow sticky sheet just where you have your monitor, resting on the pots, I used to have about 30 gnats a day at first and ended up with about 1-2 every 3 days. The gnats love yellow, just remove one sticky side at a time and they work best resting on the pots. Just be careful, I caught leaves several times when in flower, mainly through the fan blowing them into my girls.
They also make a gnat- off which is supposed to work well, if I remember rightly it works in a different way to neem oil etc, but I have never used. I only ever buy plagron light now, 1 bag costs the same as three from the garden centre, but I love the stability of it through the grow and after 2 years of using it, no pests.
Good luck.