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From The Aquarium Wiki

Polynemidae, or Threadfins, belong to the order Perciformes. There are 7 genera and 42 species in this family.

	Common name	Difficulty	Maximum Size	Minimum Tank Size
Polynemus paradiseus	Paradise Threadfin	Challenging	9.44881889763789.449 in24 cm	7575 gal283.906 liters 283,905.884 mL