imo trev keeping a pair is asking for trouble, more specimens definately spreads the aggression. that being said that's just my opinion, i've never kept more than one large armatus and i dont even dare to keep them with my gars for fear of a shanking incident.
personally, my first choice would be to get another tank and keep them seperately, followed by getting some more, and then third option to sell one. but i personally wouldn't keep em both together