hey guys i have a silver aro at around 18-20 cm and he shows no aggression (only to feeders lol) and in 2 weeks i will be getting a spotted gar at around 8-10cm. will these two fish fight? if there not compatible then ill move them in seperate tanks...reason is the aro is $350 and gar is $400 here in perth and i dont want any of them to die