The word crustaceans usually brings marine species to mind, and it is often forgotten that they also live in fresh water. Less colorful than their marine cousins, they are nevertheless interesting to observe. They prefer hard water, on account of the calcium carbonate that forms their carapace.
Few species are commercially available, even though they are abundant in certain tropical regions. Several specimens can live together, if there are a sufficient number of shelters to provide hiding places in the aquarium.
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