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They say you should clean your fish tank at least once a week, so how in the world did this guy not notice the giant sea worm that had been secretly living in his tank for the past two years? Your guess is as good as mine.

It wasn’t until YouTuber gurutek decided to break down the aquarium that the bristle worm made itself known — all 1.2 meters of it. That’s nearly four feet, by the way.

Apparently, it’s pretty common for bristle worms (also known as eunice worms) to hide inside places like this, only to emerge when they’re hungry. Sometimes, fish owners keep them inside their tanks because they help keep them clean, but when it comes time to remove them, their sharp spines can make things difficult.

Read more: http://www.viralnova.com/bristle-worm/