Along with the larger fish, these aquariums may also have predatory or scavenging crustaceans such as crabs, lobster, shrimps, and mantis shrimp. These critters are perfectly adapted to this same category of foods and when everybody in the tank is finished eating, the scavengers will keep up their end of the deal and clean up all the un-eaten pieces of food on the bottom until the tank is “squeaky” clean….or close to it anyway.
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