Good luck with you'r gar they are bad ass fish. Just for the record my 18 incher i use to have. killed clown knife, 3 oscars, dovi, florida jar, black arow, long noise jar, soft shell turtle, cobra pike, the only thing he diddn't kill was a two and a half foot fire eel. and ghost knife he use to swim around the tank with the ghost knife, In the end he left the two wimpy fish and killed the ones that were tough. So not saying putting him with tough fish he won't kill them exct. Good luck and two me that jar in that tank by him self was way cooler then most tanks with a lot of fish jar's are bad ass so gracefull and very interatctive in my opinion. GOod luck with what ever you choose. And ow ya he lived with all these fish from 4 inches or so on. So raising him with them doesn't necacairly work. If you want a arow and a community by a black lol good luck.
Sincerely,
Jeffrey allen Braley
Sincerely,
Jeffrey allen Braley