My guinea pigs fighting?

[JIn1234567]

Hi, guys. I am new to guinea pigs. I got 2 males, and they are just 6-7 month now. I am not sure if they are fighting or playing. One of them keeps making dominating sounds, mounting and pushing the other one. and the other one sounds very poor and said.
Can anyone tell me should i separate them in two cages or this is normal, because there is currently no blood issue.

 

[JIn1234567]

sometimes it become mounting

 

[Siikibam]

That sounds like normal dominance. They will experience their teens from 4-14 months of age. During that time (and even after) there will be hormone spikes. The rumbling piggy is trying to assert his dominance. For a bond to work, there can only be one top pig. It sounds like the other piggy is accepting his place as bottom of the pile

Make sure you have two of everything, all hides have two exits and their cage is big enough. The minimum recommended for a pair of boars is 150x60cm (on one level). However, we recommend you stretch to 180x60cm as minimum.

Have a read of the guides I’m linking to below.
A Comprehensive Guide to Guinea Pig Boars
Boars: Teenage, Bullying, Fighting, Fall-outs And What Next?
Dominance Behaviours In Guinea Pigs