Making your water brackish may be undesireable to your fish inhabitants.
Typically you would do a brackish tank with the crabs and maybe mollies or
other brackish type fish.


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Mainly because of the red crabs that I have. They look fine with the
current water, but from the information I have been gathering they like
brackish conditions. So I figure that adding a small amount of salt to
the tank, just enough that it wouldn't affect the fish and be
beneficial for the crab.