This is a very controversial topic as must reefer will tell you that they are primarily scavengers. For the most part it's true. When my tank is getting feed that's when they are the most active even if its day time. I have also witnessed larger bristle worm take down large chucks of droppings from aquarium habitants on several occasions. I think the real question is how are those worm appeal to each individual reefer. I myself don't like them and if I have a chance to catch larger specimen I will do so, I do tend to leave the smaller ones alone 1. Because I can't get them. 2. They do clean up all the left over food. So my conclusion is; I don't like them especially when there are size of a garden snake, I will catch any of them if I can but I don't set up campaigns to eradicate every single worm in the tank which you are probably fighting a losing battle anyways.
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