I used to have a silver dollar with my silver aro, they did fine togetherr. I ended up giving away my silver to a friend who wanted him for breeding, he's now a proud daddy. He did this thing with his mouth where it looked like he was always talking to the other fish. It wa relly funny. It was like my fish had turretts syndrome. So when he went to his new home, he taught the whole tankful how to do it. Now they all look at you and move their mouths like they are talking!