Personally,I like to have substrate in my tank and based what I think helps in areas where my gravel vac wont fit or get under.I think pistol shrimp are good for stirring stuff up under rocks helping to keep detritus/phosphates from becoming a problem.Stomatella,conch ,and brown snails are some of the ones I like to use for sediment,especially finer stuff.I'm with Gary all the way in that a bristle worm population is a good thing,the're great for the surface of sand,under rocks and even inside rocks.In gravel they tend to go deeper,ime.
Hey Gary, do you remember reading in aquarium magazines (lol) yeah,pre-internet ? How the're dangerous,predatory opportunists -clam eating ,ect..ect.. and should be irradicated at all costs.If memory serves me right the bristleworm trap was born.People would go to extremes to get them out,ruining good fresh liverock by curing it for excessive times in dark containers and rinsing it repeadly, it was preached pretty heavily from what I can remember.
There seems to be some advocates still agreeing with this thought.I've come across posts in the main forum a few times now,but I tend to stay away from being drawn into debates.Just thinking that may have caused the thread to skew a little here.