yes its a hujeta altho all the fish shops call them silver gars (which i know they are not), hes the most non-aggressive meat-eating fish ive ever seen in my life (next to my roommates coy who will eat 20 feeder fish in a matter of minutes like a big orange jackoff)-i kept him with an oscar for months & they were fine altho the oscar eventually got too territorial & i had to get rid of him due to him nipping at the gar a few times a day.
im not worried about the gar attacking the aro, because if its half as big as the gar he will leave it alone no problems, im worried about the aro beating on the gar. also if size ever became a problem i would seperate them, but only if the aro got close to big enough to eat the gar who is currently 6" long & gaining now that i have him in a bigger tank.
p.s. dont put small fish in with a coy, or they will be gone in 15 minutes flat. trust me. i know.