crayfish or other crustaceans

[Linden]

I have a 10g, 55g and a 75g. I want to make my 10g into a non-fish freshwater tank. I want to try crayfish, since I read somewhere that crabs prefer brackish water. Where can I go to find info on freshwater crustaceans?

[Lupin]

Crayfish-www.planetinverts.com (http://www.aquariacentral.com/forums/www.planetinverts.com)

[black_sun]

crayfishmates.com, bluecrayfish.com