Bristle worms in general are excellent scavengers, and a vital addition to any LSB, but if the population is allowed to get out of control it may cause a problem. A genration boom of bristle worms is usually do to over feeding, or poor nutrient output. Coral banded shrimp and arrow crabs will both actively hunt them down, but may become a problem themsleves when they reach a certain size. They are both known to attack and eat small, slow mioving fish. Most wrasses will eat bristles. Some pseudochromis will also eat bristles but can also be quite aggressive. Your best bet would be to get a six line wrasse, most will constantly eat bristles, but there size limits them from taking out the entire population. HTH