crabs

Hi, So yes I we supposedly cannot breed fiddler crabs. But are we really sure? My water is brackish and I have a heater, filter, and air bubbler. What do the babies really need cuz I might buy another tank for her. Let me know

my dad has bought me a freshwater red clawed crab today, i just wondered if anyone had any advice in care? i have ordered a pontoon dock thing to give it some air, and it seems to like my tublifix i fed it earlier. also does anyone know how to sex the crabs? and what other foods they may like...