No idea, there are too many variables than to say x amount equals y. That's why accurate measurements are needed.
Unfortunately, you were misled. The crab does need brackish, yes, but would have been fine for the short term it would have taken to cycle the tank and acclimate him to the brackish water. However, do not lower the salinity too fast either, or it can also cause osmotic shock. Lower it very slowly.
And just wondering but why do you have your betta in salt? It does not need it and does best in freshwater.
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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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