i just remembered last year i had 2 males in a 6x2x2 and i was forever seeing them chase each other. peaceful fish when in the community but 2 bulls in an arena when togeather.... these were common bristlenoses.

i have found that my longfin albino bn have never chased each other?! there is only one pot in a standard 2ft and they are the most peaceful fish togeather. they are still young and there are a few of each sex there.... commons are more agressive possibly?