How long can an African Dwarf Frog live in brackish water?

dwarf frogs are freshwater and would not survive in brackish ... moss balls (if by moss balls you mean marimo balls which are actually balls of algae) they too require freshwater ... red claw crabs need a salinity of approximately 1.012 and fiddler crabs need a salinity of approximately 1.005 - 1.010 ...