I would say that Red Claw Crabs do much better in brackish water. I have been trying to keep RCC for the last 6 months. For the first 3 months I kept my water fresh in which my crabs kept dying on me. My water quality was always very well kept, I changed the water atleast once a week. I have always given them acces to dry land ever since I set my 10 gallon up specifically for them. I had about 6 of them (2-3 at a time) in freshwater which all died. They either stopped eating then died a few days to a week afterwards, or mysteriously died out of no where. Then I decided to add a little bit of salt (1 tablespoon for every 5 gallons) and the 2 crabs that I have kept since then have survived for the last 3 months. One eats very well, the other stopped eating once, only because she molted during that time period, she is fine and her feeding habits are back now. I have also noticed that they move around much more and spend a bit more time in the water than out since I added the salt. So, I would highly recommend BRACKISH WATER, I am going to spread the word to every message board and will actually open a new webpage dedicated to the progress of my crabs. There is just too little information on the web now and the info that is provided is highly unrealiable.
