bug zapper
or u could get those long sticky traps that hang from the ceiling.
You should get some bug-i-cide... You don't have to spray the plants...
Just spray around the room, try not to spray the plants...
Regular shit like Sevin works great...but it leaves a white residue on everything... Or you can get some better shit...
Better get rid of the gnats before they lay all their eggs and then you'll have a problem...
Get a pesticide that has longevity, it'll protect for a month or more...
You don't want to run into a spider mite problem, then you're fucked.
Neem is the best protection... You have to go to garden stores to get it... Cold pressed neem oil.