[souffle]

Are they definitely two males? This is quite like the behavior you see when the female is in heat. Can you post some pics of the undersides.
They are at the point of real maturity now and a time when fights very commonly break out at 3-4 months. Hormones will be running riot too so you need to watch them very closely for fighting and also mental stress. One may be trying to dominate the other eg the pulling off the wheel and trying to bite the delicate genital area. Check both also for bite wounds and that they are both growing and one is not hogging all the food.