They're a crustacean, like an amphipod or copepod. They are sometimes found in marine aquaria as hitchhikers but are of course much smaller, perhaps topping out at half an inch. They can be parasitic and wreak havoc in a tank.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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