i have a reverse trio of the yellow tail acei with rusties, labs, and white tops for over a year and a half. all 4 species have bred for me and have never noticed any of the males trying to cross breed. The males don't seem too interested in mating with the females of the other species. My female acei has held 4 times and have stripped her twice. She usually has over 20+ fry. They are slow growers, usually dark with some striping when tiny. You will notice some yellow on top when close to 1/2". The female and male adults are over 5".