BonsaiGrl
Fill in your personal info as much as you can, or @ the very least tell us what area you’re from.
It’s kind of difficult to give advice if we don’t know the area/continent/hemisphere you live in.
It wouldn’t be a good idea to put it outdoors if you live in an area that’s still getting ARTIC weather.
Going from one extreme to another (indoors/outdoors), this would shock it even more.
It does look like you have been over watering it. Don’t feel bad we have ALL over watered before.
The gnats are living in the soggy soil.
IMHO The best and immediate advice that I recommend to do would be to,
1) Without disturbing the roots, tap off as much of the soil as you can.
2) Put in a slightly larger pot and
surround it with fresh soil to recover.
3) Water it only when it needs to be watered (search this site on H2O techniques)
4) Treat for your problem in the rest of the soil/roots (see below).
I recommend Orthenex Insecticide (insecticide, mite-icide and fungicide all in 1)
it should control your insect and soil problems.
Read, Use and follow the label!
Make sure you use this in and area you are not going to stay in.
http://www.google.com/search?hl=en&...G=Google+Search
Indoor bonsai is difficult the do and even harder to master.
I would recommend getting an indoor bonsai book by Paul Lesniewicz
http://www.google.com/search?hl=en&...G=Google+Search
Good luck, redhawk