These too are in the aquarium, but they’re good worms. Some of them are feather dusters. They’re filter feeders. They make little tubes, then pop out and look like feather dusters. Here’s a picture of the coolest one we have: 
If you can’t quite see it there, here’s a close-up: 
Don’t let the size of the picture fool you. The blue part is only about a half an inch long. Maybe a bit longer, but not much. There are a bunch of other smaller ones too. But, they are not as pretty. The tube is grey and the “duster” portion is white or clear. Not to mention only about 1/4″ across.
We’ve also got some bristle worms. They’re kind of ugly. They’re reddish brown and have rows of “bristles” on them… hence the name. There’s mixed info about them on the web. Some people say they are bad cuz they’ll eat corals. I don’t have any, so no big deal there. Some people say they are beneficial detritus eaters. Yup, that means they eat fish poo. So, that’s good. I think I’ll leave them. Besides, they’re hard to catch. 
It’s always fun to see what pops up next with the live rock.
