Yup, they are brackish. I don't know of any aquatic crabs that are freshwater. They aren't picky about how much salt, just make sure you use marine salt and not aquarium salt. I use about 1 tablespoon per 2 gallons and mine are doing quite well.
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Tina
Puffers:
Auriglobus silus x2
Colomesus asellus x1
Tetraodon travancoricus x1
Tetraodon biocellatus x2
Tetraodon nigroviridis x1
Tetraodon baileyi x2
Tetraodon lineatus x1
Tetraodon palembangensis x1
The greatness of a nation and its moral progress can be judged by the way in which its animals are treated. - Mohandas Gandhi
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