Have you got something in the tank for structure?Big tall red clay pot.If they are newly aquired keeping the tank lights off might calm them down until they get to know each other.Two males might be a constant problem.
You need to add more discus ASAP they will kill each other fairly quickly 3 is the worst possible number to be keeping.
I recommend 1 or 5 or more discus nothing in between
I would not separate them. It is all normal behavior amongst young discus. I went thru this with the last 2 I purchased. It started while they were in QT together and continued when I put them in the tank with my adults. It was always the same one doing the chasing of the other one. I've had them about 9 months now and they are just starting to mellow out and swim together. I was always afraid that the one being chased would stop eating and sulk one day, but he didn't. And now they're fine together. Just had to get them over the growing up period!
I would say just let it be. I know you have to hold your breath and hope that they work it out.