Due to their large size, black arowana need to be kept in a big aquarium. An adult should be kept in a tank with a minimum capacity of 240 gallons and a minimum width of 30 inches, although smaller specimens can start out in a smaller tank if necessary. Their tank will require a sand or gravel substrate, store-bought pieces of driftwood and plenty of vegetation. Make sure the lid of your aquarium is fixed securely, as these fish can jump up to six feet out of the water.

Tank Mates: Black arowana are generally a peaceful species of fish, although they tend to be aggressive toward members of their own species. They can be kept with other fish, but bear in mind that they’ll eat any live fish that will fit in their mouths. As such, you’ll need to keep them with other big fish, such as lima shovelnose catfish or large oscar fish. If you’re keeping several large fish in one tank, be certain that they have enough room.