I really dont know, but right now my bf has to silver's in a tank together about the same size and they are not picking on eachother, they are doing very well, both are about 7 inches and have been together from the tiny. I think if you get them when they are small together they should be fine, but if you get them at different times and ones much bigger then the other and they havent grown up with eachother, then prob yes. Thats just my own experience. My bf had 1 silver and 5 Jardinis once and the biggest Jardini left the silver alone but was very agressive against all the other Jardinis in the tank. ne ways hope that helps some.