If this is my case I would keep Xback singly for main display tank...no stress, no bullies and scar or torn fins...etc...A perfect Xback for main display
*If you really into Aro community tank then I would sell those big Aro and get a set of young Aros and raise them together, soon you most likely get a dream Aro community tank...it would take a lot of courage to do that hehehe![]()