This is a list of various species of invertebrates , animals without a backbone, that are commonly found in brackish aquariums kept by hobby aquarists. Some species are intentionally collected for their desirable aesthetic characteristics. Others are kept to serve a functional role such as consuming algae in the aquarium. Some species are present only incidentally or are pest species.
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Fiddler Crab, Uca pugnax [1]
Perisesarma bidens , Red Clawed Crab
Amano Shrimp/Yamato Shrimp, Caridina multidentata
Grass Shrimp/Glass Shrimp, Palaemonetes paludosus
Blue Crab, Callinectes sapidus
Olive Nerite, Vittina usnea [2]
Source: [3]
Lolliguncula is the only genus of cephalopods that is known to exist in brackish water. They can tolerate as low as 8.5 PPM of salt.