EMERGENCY urchin crushed by clam!

Dom

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24 hour (ish) update:
Moved him to a holding tank I have running. He’s wondered around plenty and appears to be alive but still some very visible damage. Any suggestions would be appreciated

If it is behaving normally, I would place it back in the DT and let it go about its business. Monitor. It may heal up.
 
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SaltyWalty

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If it is behaving normally, I would place it back in the DT and let it go about its business. Monitor. It may heal up.
The holding tank his is in is a coral/live rock quarantine/holding. It’s pretty much a display all parameters are monitored and there is more coralline growth since there are no other urchins, and I don’t want to move him again I’m worried it might be more stress.
 

Dom

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The holding tank his is in is a coral/live rock quarantine/holding. It’s pretty much a display all parameters are monitored and there is more coralline growth since there are no other urchins, and I don’t want to move him again I’m worried it might be more stress.

Then let it be right where it is.
 

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Oh - I always thought that when the shell (test) was broken, the urchin would live for a bit, but then eventually die. But then, I would always just freeze them at some point after that happened, so I never really tried to see if they would/could repair that amount of damage! Echinoderms have have an open vascular system, and sea stars obviously regenerate, so I guess I should have been more optimistic!

Jay

I’ve seen damage to urchins like this a handful of times but I sadly never saw one recover long term :( sometimes days, sometimes weeks, but they always passed.

Could be that LFS systems are just too messy for recovery.
 
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SaltyWalty

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Final update:
Unfortunately it’s appears that’s in the clam vs urchin battle the clam comes out on top.
The little guy was hanging in there this morning when I was checking on the tank, was even carrying around some shells and such.
However, when I checked on the tank this evening, this was all I found of the little guy.

Will probably do a large water change on the tank. Should I run a bag of carbon as a precaution?
 

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