Silver dollars get big and are really active and they need to be in schools.... I think a larger type of tetra would be better....Thank you everyone for your quick and CONSISTANT replies! I see this was a good move on my part and clearly a more active and helpful forum. I was kind of leaning for toward to GT's anyway so thanks for telling me what I wanted to hear lol. Next question, dither fish. Do I need them? What should I be looking at? Old forum said silver dollars?