[cypher]

As Ria said they are solitary animals & although they may be ok together for a short while when very young they will start to fall out as they mature & need to be separated.
It does sound as though you need to separate them as soon as you can before things get worse, things can flare up very suddenly into fights & injuries, even before that stage it can be very stressful for them living together & the stress itself is bad for their health.