Well hound21 jardini are known to be aggressive and are the most aggressive arowana in most peoples opinions, you can't do much to stop it if it wants to kill it will , you can limit this buy loosing the feeders this just promotes attacks on tankmates , get fish that dont occupy the same tankspace (bottom dwellers like your cat) , plenty of hides for them to get out of danger.
Jardini are usually most aggressive between 8-15" ive found but this time they've usually took over the tank and seen off any tankmates they dont want
Jardini are usually most aggressive between 8-15" ive found but this time they've usually took over the tank and seen off any tankmates they dont want