I have a six line wrasse and he does a great job. I used to have so many bristle worms in my tank coming out when I fed that I never bothered to try and count them. I would have to guess at 40-50 in a 29 gallon tank. Since I put the six line in I rarely see more then 2-3 at a time and mostly I see none. The six line always has a full belly and looks quite happy. Plus six lines are a great fish to watch swim around the tank. They are red with six greenish lines going up their sides. They have a green tail and two green lines on each eye. Mine like to dart in and out of the nooks and crannies on the live rock and will swim sideways and backwards. Very amusing IMO. They secrete a mucas bubble to sleep in at night for protection, I often turn my lights on in the morning and watch him wake up and break out of his little bubble. Very cool and very useful. I have seen several coral tanks where the only fish they kept was a six line and a lawnmower/algae blenny just for maintenance.