I'd recommend a black arowana as a gar companion over a silver, they seem less aggressive than silvers in general. Though a big gar will still beat up either type of arowana if it feels like it.
Not an advisable combo, I only do it with a black because I have enough big tanks where I can easily and permanently separate large fish.
Not an advisable combo, I only do it with a black because I have enough big tanks where I can easily and permanently separate large fish.