are crabs nocturnal?

shoura

Premium Member
I am just setting up my first tank and got a mithrax crab yesterday--he started attacking the algae immediately then disappeared after a couple of hours--I saw him again after lights out but this morning he is nowhere to be seen. Do they only come out at night?
 
Not always, I used to see mine during the day all the time. They do tend to hide a lot tho.
 
THey're pretty cryptic ---hide at the first sign of movement from you. The only reason he didn't hide at first was that he hadn't established a bolthole.
 
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