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The urchin isn't stuck but chooses to hold fast. Looks like the Caribbean variegated urchin . They can be different colors of white to purple to green or a combination of the colors . Urchins can usually be exposed to air without problems. They will move down to the new level of water as it drops slowly . If water levels drops rapidly they sometimes let go completely and fall back into water . I wouldn't try to move him. You might injure him .he is just trying to overcome the transition to your tank . Hopefully you dripped acclimated him over a long period .
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