Help on getting rid of white worms

[numbskull]

Recently I found out that I had a lot of small white worms hiding underneath of my tank inside the Gex soil. I had tried to suck them out during water change but everythme I tried to do so they will immediately hide back down into the soil and later to emerge again. Though sometimes I am successful but most of the time I fail. Is there any ways to get rid of them without getting my shrimps out?? And is it because I overfed them that's why they appear??