Minimum arowana fish tank size: 250 gallon.
Average adult size: 2–3 feet.
Ideal water temperature: 75-86℉
pH level: 6.0-7.0.
Water hardness level: 1-8 dKH.
Ammonia level: 0 ppm.
Nitrite level: 0 ppm.
Nitrate level: less than 40 ppm.