My new Guinea pig and my other have been lunging at each other back and forth? To me it looks bad?? Its scary lol .Is this agression or normal dominance behavior? Should I separate them for the night? They had a proper introduction and non of this occurred. So I decided to put them in their cage and then they started this. C&C cage 3 by 5. 2 of everything. They long at each other when they get close or one of them wants to go in the others hide.