yep fact is you cant keep fish with most freshwater crab, and a 10g tank will be just about ok for one.
there are no tank mates for freshwater crabs
all crabs are omnivores, but lean toward veggies.
Thanks for the info boboboy you have been very helpful. Think i will get look more at red claw crabs when i do change the set up. How many do you recon i could put in a 10 g tank, was thinking I would only be able to put one or two in.
Also as its going to be a brackish tank what fish do you recommend i put in with the crab(s)? I have heard livebears are ok, such as guppies and platies, any others?
Mollies, swordtails, raindow fish and platties, are a good starting point. id pop over to the brackish section, and have a look at the fish that are compatible!