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Guy Had No Idea This Enormous Bristle Worm Was Living in His Fish Tank

How could anyone go two years without noticing something this huge? Well, humans have been around for 200,000. Bristle worms and their polychaete brothers have survived five mass extinctions.

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Many aquarists fill their tanks with live rock, i.e. chunks of coral that still harbor biological and bacterial matter. Bristle worms often piggyback on these corals, infiltrating a tank and growing to tremendous size. Generally they remain hidden beneath rocks and coral, poking out at night to feed.

Some people choose not to get rid of them. On the one hand, they’re scavengers who clean detritus and generally don’t bother fish (although they can eat coral if they’re desperate). On the other hand, their tiny spines make them painful to handle—another aquarist described the feeling as analogous to fiberglass—and therefore difficult to remove. In this case, the worm grew to almost four feet long and draining the entire tank was the only way to get rid of it.

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A four year old YouTube video? Really?

They found someone sploidier than Casey....