09-07-2010, 10:30 AM
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I admit to knowing nothing about fiddler crabs, but from my limited reading I understand they must have brackish water. Apparently they are often kept in freshwater in stores, but cannot survive long in freshwater (one site says maybe a month or a couple of months before they will die). Not suitable for a normal aquarium, aside from the need for salt (which would harm if not kill the corys and other fish) they need land with sand. In general, fascinating creatures like crabs, lobsters, crayfish need proper environments just as fish need proper environments to be healthy. The two groups do not mix well.