Crab died

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Those are small polyp stony corals...If you are new I doubt you have them, which would be a reason for its death. Is your tank cycled? What are your parameters?
 
Tank is cyceled i did find a malt of my othere crab it could be a malt but is was harder then the one i found today rock hard needed a knife to brake it it did not float and he was fine a few days ago he grabed a sinking pelt and ran off and ate it i no he needs coral to live but he was doing fine 10g atm and a few otherw crabs and fish not much tho
 
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