Introduction to the Ancient Arowana. Characteristics.   Aspect Details Difficulty High; needs experienced care. Lifespan 15-20 years. Tank Size At least 250 gallons. Tank Setup Secure lid, minimal sharp objects, spacious for swimming. Water Parameters Temperature: 75°F – 85°F, pH: 6.5 – 7.5, Hardness: 5-15 dGH. Filtration and Aeration High-capacity filter, strong aeration. Lighting … Read more