mason jar half full of apple cider vinegar and a squirt of dish soap, couple of yellow/blue sticky traps taped round the top to attract em in.
Springtails won't do much damage, they eat dead and decaying organic material. And the biggest issue with adult fungus gnats is the faeces they leave behind on the plants
Larvae will eat roots and can become an issue if left uncontrolled.
Another option is buy an electric fly zapper and drop it in ya tent with the lights off for an hour
For the ones already in the soil, Diatomaceous earth sprinkled lightly on top of the pot will help.
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