Thanks for all the replies. Tank is getting pretty full so a small group of tomini's probably will not work, only a single. I do like the more rarer fish so maybe I will go with the black tang,which is one reason why I was thinking of it. Do these two both eat the same kinds of algae? Does one eat more different kinds of algae than the other? I need something that is a good algae eater and not too aggressive. Don't won't it hurt my butterflies but also stand up to my interruptus who is a real butt head and more on the aggressive side.