Arowanas are freshwater bony fish of the family Osteoglossidae, also known as bonytongues (the latter name is now often reserved for Arapaimidae). In this family of fish, the head is bony and the elongated body is covered by large, heavy scales, with a mosaic pattern of canals.Size‎: ‎Up to 48 inches in the wild.(120 cm)PH‎: ‎6.0 to 6.5Tank‎: ‎72 inchesBreeding‎: ‎They have been bred in captivity.Temperature‎: ‎75°F - 83°F (24°C - 28°C)PH‎: ‎6.0 - 7.5