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Quite over feeding is the easiest. There are traps and some wrasse eat them, but like anything, it'll only slow down the problem. U stop feeding so much and they will die.
They're harmless and serve a useful purpose. The only time they get out of hand in my experience is when a tank is overfed. Even then they only eat the leftover food instead of allowing it to rot and foul the water. Leave the little guys be.
Opps, sorry I meant Arrow Crab, had one for a long time till the lobster got him, there are youtube vids of them eating bworms, like someone said they are harmless unless you touch one, and they seem to come on in big numbers but then the population seems to fad out. I use to worry about them but now Im sure I have some small ones but I dont see them often
When my bristleworm population starts getting out of control, I drop a couple bumble bee snails in it. They seem to enjoy them until the hermit crabs get jealous of their shells.