Juvenile Threadfin Geophagus Wrestling?

[tetraodon_biocellatus]

I have a pair of young threadfin geophagus in my 55 gallon, no signs of aggression for the last 6 months but today they have been wrestling side to side ramming each other with their gills flared. Should I be concerned/move one of them or is this natural. Both fish appear heathy at the moment and there are enough places for each fish to hide and avoid the other. They seem to be choosing to fight. 
 
Any advice?
 
Thanks! 

 

[BerryAttack]

do you have an area where they can breed? 
if they are male and female then they are showing signs if they are ready to breed. if there is no damage and both are equal, one isn't being chased, not allow to eat... bullied then there should be an issue. just watch to make sure that there are cuts etc and it'll pass.