I have two 9~10" H. psittacus that have been in a 120 for about 18 months. They lived together with no problems for over a year, and then one started getting picked on, so I divided the tank. Everything has been fine since. Last night I was cleaning the tank and took the divider out and with seconds, they locked lips. I could even reach in and touch them, they were so focused. Do I have a potential pair, or are they just fighting? Any thoughts?