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At Newquay’s Blue Reef Aquarium, fish started disappearing from one of their reef tanks.  After observing for some weeks, nobody could figure out what was happening.  So there was nothing left to do but disassemble the reef rock by rock.  About half way through, they found Barry, a 4-foot long marine worm.

Thanks for the link Rob.

Barry; likes to hide, eat fish. Click image for more