They are in a tank with larger fish including an 8 inch Vieja melanura, 7 inch Green Terror, and a bunch of 3 to 5 inch African peacocks and Thorichthys elioti. The pair is dominant over similar sized peacocks and elioti, will stand their ground against a Green Terror twice their size, and will only back off from the Vieja that rules the tank. They are aggressive counter puncher towards other fish, but can be actively aggressive conspecies. When they were younger and before pairing up, the two butt head at each other constantly, and chased aggressively away their smaller siblings. They have only paired up recently, but no breeding yet.
http://www.youtube.com/watch?v=MHUsrVds6R4
[video=youtube;MHUsrVds6R4]http://www.youtube.com/watch?feature=player_embedded&v=MHUsrVds6R4[/video]
http://www.youtube.com/watch?v=MHUsrVds6R4
[video=youtube;MHUsrVds6R4]http://www.youtube.com/watch?feature=player_embedded&v=MHUsrVds6R4[/video]