Only thing I've ever had a problem with is gnats, and spider-mites. For gnats, a simple clap of the hand or raw slice of potatoe in the corner usually does the trick. For mites, I use this....
Found this awhile back, unsure who it's by:
1/4 cup Baking Soda
1/2 cup Apple Cider vinegar
1 Tablespoon Lemon Juice
2 drops dish detergent
1/4 Teaspoon Epsom Salts
Take a cup of very hot water and desolve the epsom salts,take rest of ingredients and place in a clean 2 liter bottle and let work out. Add epsom solution. Add water to fill to 48ozs(3/4 full).Shake well.
TO USE: Cover soil/medium with plastic,with lights off mist plant all over,especialy under leaves,
Wait 20 mins,then spritz off with clean fresh water shaking as much water off plant as you can.
The fresh water spritz rinse will remove the solution along with the desolved remains of the mites and their eggs.