Is my Urchin dying?

DoINeedAName?

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I have a pincushion urchin, two actually, and one of them seems to be dying. He’s larger than our other one and he’s been dropping spines randomly since day one. He does eat and move around, but I’ve recently noticed a small hole in the very top of his shell (is shell the right word? It’s just at the top of him) and a small black spot on his side. He also started pulling his spines flat at the top near the hole, but today he had a lot pulled flat (pictures for reference that I just took of him)
EBC79FFE-8E94-4441-97CD-50F3E6C75D1B.jpeg 4C10CE22-8843-48F2-BF1E-977258107186.jpeg 7E34CF92-C0CA-4B4C-B93E-638AEE090191.jpeg
 

Sleeping Giant

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The hole at the top is their bum hole, but the laying down of its spines doesn't look good. Do you have fish that could be picking on it?
 
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DoINeedAName?

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I have a pincushion urchin, two actually, and one of them seems to be dying. He’s larger than our other one and he’s been dropping spines randomly since day one. He does eat and move around, but I’ve recently noticed a small hole in the very top of his shell (is shell the right word? It’s just at the top of him) and a small black spot on his side. He also started pulling his spines flat at the top near the hole, but today he had a lot pulled flat (pictures for reference that I just took of him)
EBC79FFE-8E94-4441-97CD-50F3E6C75D1B.jpeg 4C10CE22-8843-48F2-BF1E-977258107186.jpeg 7E34CF92-C0CA-4B4C-B93E-638AEE090191.jpeg
Extra pic of black spot and many dropped spines
3C607732-877E-49A2-9565-9A9774922066.jpeg
 

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