Situation in my office with spider plants: I recently re-potted two plants with new store bought soil. One of the reasons I re-potted to begin with is that one of the spider plants looked like it was sick. After re-potting with new soil, I found tiny little flying flies (smaller than fruit fly) on two of spider plants (not finding anything on my pathos plants). I dumped one of the spider plants because it was not getting better and I found the little flying things coming out of the soil. My question for you: is there a recommendation for treating the soil or the remaining spider plant? Or do I just need to throw away the 2nd spider plant and hope that the pathos remain healthy?