Jonah

I am very new to this saltwater stuff having just set up a nano-cube.

Last week I added 2 cerith snails and a Blue legged Hermit crab to the tank.

For the 1st week my crab was climbing all over the live rock eating all the algae that was on it.

How ever for the last day he has been sat inside one of the caves in the LR and has not moved. I am fairly sure he is still alive as his antennae are still moving but he himself has gone back into his shell and not moved an inch now in 24hrs.

Is this normal behaviour?

the water is Am = 0 , nitrite= 0 and nitrate <5 so the lack of an am spike also seems to suggest he is still alive.

I also have a few spare shells of different sizes in the tank for him.