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[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.