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[Myka]

Google `reef copepods` and `Spirorbid worms`, then go to Images and there are some great photos. Both are found in nearly all healthy marine tanks, and both are beneficial.

[Sean]

Right on, I noticed them running around but I never knew how they reproduced. Thanks for the help!

[lastlight]

The amphipods are a lot more fun to watch. The fish also keep their numbers down but somehow they can grow pretty big. Even of you don't see them often times a really big molt will go sailing around the tank so you know they're thriving.

[Myka]

Originally Posted by Sean

Right on, I noticed them running around but I never knew how they reproduced. Thanks for the help!

Well, if they are running around they will be Copepods (bigger ones are Amphipods), not Spirorbid worms! You will probably find the Spirorbids too if you look closely, they are also only 1-2mm across, but are stationary. Look in lower flow areas like in the overflow and sump. They will be stuck to the glass.