Why Do Urchins Like to ‘Wear’ Corals and Rubble as a Hat?

[Reef Builders]

Owners of some short spined species of urchins such as tuxedos and pincushions may have noticed their spiky echinoderms occasionally sporting an assortment of rubble or coral. We often admired this remarkable phenomenon which looks quite interesting, but as we’ve previously documented this can pose a risk to corals in your reef tank if your…
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