I have what's called an Arrow Crab living in one of my two saltwater "reef" tanks. Among other things he eats what are called bristle worms. Bristle worms aren't necessarily bad little creatures, but they sure can be ugly. They live in pieces of live rock - coral-like rock, full of pockets and holes and little marine critters, like these bristle worms.
Bristle worms spend most of the day hidden and out of site, until I put some food in the tank, and then they extend themselves with their little tentacles out from the rocks, searching around for the food which I gather they can smell in some way.
They are scavengers, and as such are useful for keeping tanks clean. But there's a down side. Without natural enemies, they proliferate all over the tank and pretty soon they are everywhere. So in a fit of revenge and wanting to exert my power one day, I went and got this Arrow Crab, which is known for eating among other things, bristle worms.
And much to my glee, a few days after introducing the gangly looking critter, I saw him (it, her?) eating one of these (him, her, it) bristle worms.
Live does have it's happy moments.
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