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From The Aquarium Wiki

Arapaimidae, or Bonytongues, are a very small family of just two fish species that belong to the order Osteoglossiformes.

	Common name	Difficulty	Maximum Size	Minimum Tank Size
Arapaima gigas	Arapaima Piracucu Pirarucu Paiche	Very Difficult	180180 in457.2 cm	10001,000 gal3,785.412 liters 3,785,411.78 mL
Heterotis niloticus	African Arowana African Bony-Tongue Heterotis Arowana Stoneside	Challenging	39.37007874015739.37 in100 cm	150150 gal567.812 liters 567,811.767 mL