isnt that a fungai gnat ? Fungai Gnats feed on moisture and rotting vegative growth they here is some info i found online that may help :)
How to Get Rid of Fungus Gnats
Use the following methods to catch and kill fungus gnats that are present in your home. Use a combination of methods and do it repeatedly for at least 4 weeks.
Dry Out the Soil
For an over-watered plant, you must begin drying out the soil. Overwatered plants get root rot, and rotten roots are a perfect food source for fungus gnats. As a side note, overwatering will eventually kill most houseplants, so please don't do it.
Remove Dead Leaves
If there are dead leaves or any other kind of debris in the soil or inside the liners or containers, it must be removed. Dead, decaying material is a food source for gnats.
Massacre With Steel Wool
This method works like a charm. Place a thin layer of steel wool on top of the soil of your potted plants. Any larvae trying to fly out will literally get shred to pieces, and adults flying in to lay their eggs will also die. Leave the wool in for at least 4 weeks to ensure that all generations of larvae are exterminated as they try to fly out. It's a simple yet magical technique.
Remove the Top Layer of Soil
Once you believe all the larvae are dead, remove the top part of the soil. This is to ensure that any eggs remaining will be removed. Replace this top half with sand. Sand drains well and dries quickly.
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