Microbe-Lift BMC. Use it every watering until they’re gone.
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Cinnamon sticks
I couldn’t win against them when i used living soil in a tent. Tried everything.
Switched to coco coir and bottled nutes and have not had any gnats.
A deep clean of my tent between runs helps as well.
My soil is 6 years old and I rarely have issues. But when I do Microbe-Lift takes care of it.
I use “gnat traps” to keep them under control. It wont eradicate them, but it makes a huge difference. I stick them at the bottom of each pot.