I have a CBS in with a cleaner and 5 or 6 peppermints, snails, crabs, and they all get along fine. If you want to rid of bristleworms get an arrow crab, but IMO bristleworms are great. I would buy them if I could, they make for a wonderful cleaning crew. I have a 125 that has a bristle that has to be at least 1' long, and is every bit as thick as my index finger, and I used to have tons more, but my arrow has decimated the population.