i think you will be ok with small fish! can't speak for every fish but mine are fine with small fish (like the rosy tetras) and they even leave the dwarf gouramis alone while being nipped and chased! It is not the best idea to put them in with any other aggressive fish. I do have a problem though, my tank is too small for these fish! I need to go bigger or longer because of their energy!
best freshwater fish ever! they talk to each other by changing colour and spawn daily! I have one male and 4 females. need to feed them a variety of foods, other then that, they are very simple fish! tame enough to swim to your hand!