I was in my room earlier and i was laying on the bed. I got up and saw my green terror and red devil jaw locking. At first i said, no biggie, but it started to get pretty nasty. They continued on and off for about two hours. There doesnt seem to be much damage to either fish except the top of the devils mouth and on his hump where the terror was jabbing into him, and on the botttom of the terrors lip. I think maybe it was territorial as the terror stays on one side of the tank now and the devil on the other in a big clay pot i recently put in the tank. could they have been fighting over this new territory?? I have never seen these two do this before and usually they have a pretty good temperent towards each other. I wasn't too concerned at first because my terror and dempsey use to do this a little, but these fish would win one lose one and keep coming back and i was worried they were going to fight till they were dead. Should i seperate them? Another thing, post attacking the red devil the green terror would swim up to him, turn around flare out his gills and shake really violently, to where i thought he might be having a seizure ( might sound dumb, but relaly i was worried) and i attempted to net him as i thouhgt something was wrong, but he continued doing this everytime before they locked up. i just want to know if this is normal and should i expect it to happen often. thanks for any help.