hello ive owned a few silver aros in the past but i wanna learn more. i always see pics of austrailan, asain, african, and south america. and i also see jardini, red, gold, silver and black. i know the the silver aros are from south america. but where are the rest from? and which are most aggressive in order also which can be kept with angels and stingrays in a 500 gal. thanks in advance
