Sounds like a fungus gnat larvae - very NOT good for your plant. They eat your roots - eventually will burrow up the center of the plant. You know what it looks like, I would google it and try to find out what it is as soon as possible.How do i know that is not good for my plant ? I cannt see them to take a pic !!
can you give me its name ? or mark ? there are many ?
i think what i understand from internet that is wight springtails are good for the soil ? can you chek that pulshit ?