If they wander out from the chaeto (some of them will) some will make it into the display without getting mulched by the return pump. For the most part the population will regulate itself meaning that if you overfeed you'll eventually wind up with a terror scene from worms attack, but if you feed at reasonable levels you'll likely only see one or two when the lights are out as most of the time they'll just discretely much detritus and left over food in the rocks.
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