ok, so i understand that 2 or 3 arowanas will fight but 9 or 10 will get along? Yesterday i bought 10 silvers that are about 7 inches long i put them in a 150 that was full of tiny baby guppys. until our monster tank is finshed. What a show the arowanas love guppys so they are all doing fine and i cant wait to watch them grow. what an amazing fish.