how to care for fiddle crabs ?

[flower girl]

well i just got 3 fiddle crabs,i setup my tank on little info.i have rocks ,plants,and things they can climb on also a air pump .should i stay with the freshwater or add the salt ?what are things i can do to make them happy and stay healthy?

 

[allaboutfish]

have some land for them. definently get some salt and make it brackish. get the tool tht measures it. you want a reading of 1.005-1.010 good luck!