hi jarred..small silvers are best kept alone until they get to about 12".. really depends if they will eat them.. i have silver dollars in my pond with the aros, rtc, and tsn.. yes they did get eaten up a bit but now i dont see it.. they could be safe for what you know.. but best to keep the apart for now (and always, that is if you want the red head geos alive).. all the best..