Odd Oscar problem after buying new filter

I read that they would do that to 'test' the strength of potential mates as well, but do make sure that the lips are not injured.
 
They also do that for aggressive purposes like Voodoo said, but it could be a mating display, too...don't necessarily rule it out!
 
No, no abrasions or other signs of injury

They seem okay, and I am watching them as carefully as I can. I'm currently fishless cycling another tank to move the Firemouth and Tiger Barbs into, and then I'll re-landscape the Oscar tank.


I'll post further if I notice anything else.

Tom
 
AquariaCentral.com