If you want protection for clams from small snail drills, or from round worms, etc then a six line is great for that, however, with the great cleaning and protection the six line offers comes a not so pleasant side once established. a sixline is not a fish to add just to view, and should be added on a need for its specialized good points. I have always had one in my reef tanks and yes problems with adding new fish after, but, the benefit to the corals and clams always outweighed the bad points, that is if corals are the prime theme of your system. Also you will not retain many small duster worms and the like as the wrasses will work their way through the small crustacian menu. they will not harm the corals and will seem to nip at corals from time to time but are cleaning off small food stuffs, they are not actually hurting the corals and occasionally they will appear to nip at fish, but are only cleaning parasites, it will be very easy to determine an attack from a mutual action. good luck. wish you much success. Oh and by the way I have also keep the iris wrass, very pretty, more expensive and seems to not be as bad as the six line but will also perform cleaning duties on the corals. the diff is the iris wrasse gets larger and burries in the sand at night.
