Lots of people consider them to be a pro addition to a reef tank, but I am not a big fan of them. I have seen them eat detritus and fish poop but at the same time I have been stung by those damn bristle countless times so every chance I got I pull them out of the system. Think of them like mice, if you see one in the open, there is probably a hundred of them hidden in between your wall.
BTW if they are in your sump then that means they are also in your display.
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