These are the bright gold form of Aplocheilus lineatus. This is a young, adult pair. This is large for a killie and would mix better than most in a community tank. I wouldn't put them with very small fish though as the have a good sized mouth and aren't afraid to use it. They are content to use them on flakes, however. Just be sure to cover their tank as, they are excellent jumpers, like most killies. Typical for non-annual killies, they have been breeding continuously into a mop for me. I may list some of their eggs separately.