Maxpayne is right Fiddler crabs are brackish and may or may not need basking place.
However i think southern justice is talking about Red Claw crabs which are fresh water and are fully aquatic (do not NEED to get out of the water)
If there is no place for them to get out of the water they will constently try to find one
They like a neutral ph and are sensitive to meds and ph changes. Actually they are allot more sensitive than most people think.
Allot of people will tell you different things about them like they are not fully aquatic and so on but i have had two male red claw crabs in my 55 gallon community tank for about 5 months and they have done great. I did loose one recently b/c i broke out with a case of ich and had to medicate but the meds told me on the bottle do not use with inverts, it was a risk i had to take. They got along fine with my fish. They are way too slow to catch a healty fish but may chew on a dead one if it is on the bottom.
As for cause of death of yours i have no idea. before the 2 i have had for a while i had a few die on me after having them for a week or two but found no cause of death. the only thing i could think of is my ph was a little too high at the time and maybe they spent too much time trying to get out of the water and not enough time eating?!?
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