Arowana - Silver Arowana: Care Guide, Tank Size, Diet and More...

The arowana is a facultative air breather and can obtain oxygen from air by sucking it into its swim bladder, which is lined with capillaries like lung tissue.

While it is not banned on a federal level, some local governments may have banned them, so it is worth checking your local policies.

I wouldn't choose this if you wanted to maintain arowana and angelfish.

Hence, regular water testing, tank water replacements, and water treatments must be carried out as necessary.