The yellow coris wrasse will hunt them and eat them as well as the neon dottyback, arrow crabs are not reef safe
IMO. The wrasse may or may not try to eat the shrimp.
However, I do not recommend that you remove the bristle worms, the predjudices of the past have been overcome and the hobby now sees them for what they are, beneficial detrivores and an important part of a reef ecosystem.