Lethargic Porcelain Crab - Molting?

[Flash]

Doesn't look good! How is your water? When was you last water change?

I would also get water ready for another water change is your crab is infact dead. Don't want any more large spikes.

[leezard]

The water is great -- has been for a few months now. Last water change was last Monday -- we tend to keep it up weekly, but decided against it last night because of the crab. Figured we'd wait until tomorrow (since both my hubby and I are out today and can't do it).