Hermit Crab Going Shell Less?!?

MombasaLionfish

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What is this hermit crab doing.
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He has been like this since yesterday. He keeps going in and out of shells mostly out. He is out at the moment.
 
The calcium level must be over 600. When the water gets that hard the crab feels comfortable without a shell and will happily run around topless.
(I have no clue what this animal is doing today 1April, 2019 ) :)


Actually, reading your second post I believe he is looking for a proper replacement shell. Sand crabs generally have a preferred shell (from a dead mollusk) that fits and they feel comfortable in. As they grow they will move into larger shells.
 

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