Hi and welcome to the forum
Uarus are like any other cichlid when they mature they start looking for a mate. If you have 2 males they will fight. If you have a male and female they will wrestle and lip lock and push each other around to see if the other fish is tough enough to be a worthy parent. If one party is not acceptable it will normally get bashed.
If you want a breeding pr of cichlids you should buy 8-10 young fish and grow them up together. When they pr off you move the prs to another tank.
You will have to monitor your fish and if they start doing physical damage then they will need to be separated.