Hermit Crab Going Shell Less?!?

[MombasaLionfish]

What is this hermit crab doing.

 

[MombasaLionfish]

He has been like this since yesterday. He keeps going in and out of shells mostly out. He is out at the moment.

 

[KrisReef]

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.

 

[MombasaLionfish]

Still shell less but also dead.:( Does anyone know what happened to him?