the blue ones sound like socolofi, the ones that turn purple with an orange dorsal may be hongi or rusty, most already have some color tho. what youre gonna hear is dump the kenyi, the zebras and labs will crossbreed, and dont distribute fry from the tank. it wont be overstocked so you could add more, after you take back the kenyi. after you are sure of the sexes you will want to get the male to female ratios right. there are plenty of articles to read here so get busy. good luck and have fun.