He is molting? Losing his feathers? That can be really hard on a bird, and they often will feel cranky and should be given extra protein food to be able to grow feathers right. It is not unusual for roosters to fight/ pick on each other, they need to work out a pecking order, which maybe what is happening if your one rooster is younger and just starting to mature, he is challenging the older rooster. Depending on how much room you have and the set up, you may have to separate them if they wind up not getting along. With feeding time, do you not have food available all the time, or do you only feed them once a day? Most commercial feeds recommend laying hens especially have food available, if they are hungry the dominant birds is going to want to eat first, and that is usually the head rooster.