Need help figuring out what kind of worm this might be

[rsargent]

I lost all my fish to ich and am in the fourth week of recycling the tank. In the tank now are a LTA and a Sebae anem, a cleaner shrimp, an anemone crab, a strawberry crab a couple of snails and hermits, some soft coral and gorgonia. I have noticed this guy as well as some little critters that remind me of ants in both stature and activity just after the lights come on. Any help would be appreciated. Thanks

 

[saxman]

That's a Dorveillid polychaete. It's a harmless herbivore.

 

[rsargent]

Cool! I appreciate that! I was a little about a fluke of some sort so it's good to know that isn't the case. Any idea what those little ant-like things might be? I've had baby star fish and sea urchins come out of that live rock but these guys are so small they are really hard to see but the move forward and back rather than sideways like a crab and the move rather quickly.

 

[saxman]

I did see a faint image of a couple of Munnid isopods, and you likely have copepods (much smaller) as well. Great free fish food!
For future use, here's a pictorial hitchhiker guide...match your critter to a pic for an ID:
http://www.lionfishlair.com/hitchhiker/hitchhiker.shtml

 

[rsargent]

Wow! Thanks Saxman, excellent resource for all that weird stuff I didn't put in there intentionally. Thanks for the referral.