I actually had similar little black bugs on my aloe plant, potted right next to my VFTs. They grew up to be gnats of some sort, which my VFT happily fed from. However, they multiplied fast (30+) and became a problem. To get rid of them, I flooded the soil on top and let the little buggers float out of the pot. Also rinsed off the bottom holder of standing water where they also hang out. Left the plants outside for two days. That got rid of most of them, I had to repeat this twice.