Sounds like fungus gnats. As @MattyBear said.
The only thing I’ve found that works is BTi, ( Bacillus thuringiensis israelensis). The other strains of BT don’t seem to be effective. You can find it on eBay and through a google search.
Don’t overwater your plants, let them dry out. If the gnats don’t completely disappear in two weeks get BTi. Or, you can be proactive and just buy some. $15 will get you 2oz, which is plenty.
The sticky yellow paper catches them, but all it takes is one little gnat to lay 300 eggs. It’s a good way to judge your infestation.
@Cbatchaos I suspect you’re on the edge of having PH issues if you don’t have a proper meter.
Less is more when it comes to nutrients, so I would cut back, a bit. The light won’t be enough when it goes to flowering.
Your plant isn’t very big and maybe isn’t requiring to be fed in the soil yet. It’s big enough that is probably requiring more than spray of water though. About how much water do you give it and how often?
Side note and likely unrelated, your light is pretty small. That’s why you have the big gaps between branches. This can get out of control before too long.