I have a 150 gallon tank with large passive fish and is almost fully stocked. I want to get a really cool fish are there any arowana's that can fit a 150 gallon aquarium and can live in harmony with catfish and panfish?
Sorry, but not for a 150. There's just not enough width for an adult arowana of any species. 6'x2' is the smallest footprint recommended for a jardini (the smallest species), and most aro keepers suggest 8'x3' for a silver arowana.