Silver Arowana are classed as prehistoric fish, they have evolved only slightly compared to other species of fish on this planet. They also have a nasty bite as their tongue is also covered in small teeth so treat the Silver Arowana with respect and keep your fingers at a safe distance from the fishes mouth. As adults they can grow up to 4 feet in length so will require a very large aquarium. They are active swimmers so the aquarium needs to be at least three times their body length to give them space so an adult specimen will require an aquarium that is 12 feet in length, always remember this if you decide on purchasing a small juvenile that may be only a few inches in length. They are also excellent jumpers so the aquarium will need a tight-fitting lid to prevent them from leaping out of the tank.
As expected with larger species of fish they are high waste producers and with the size of the aquarium required a large filtration system will be needed, keeping these fish for a long time is not cheap so make sure your allowed budget will let you cover all the needs that the Silver Arowana demands.