I have a bunch in my tank. For the most part I love mine, they are fun to watch. My hermits include 4 Zebras, 1blue legged, 3 crimson, 2 Halloween, and two different unknown ones a white one "Gandalf" and a black one "Sauron". The only one I hve a problem with is guess who? Sauron. I came home yesterday from work and he was attcking one of my expensive Halloweens, big no-go. have since imprisoned him in Mordor ie: the overflow tank. My Halloweens are he hardest workers, clearing whole tracts of rock of nasty colored algae and leaving the polyps completely alone. In my opinion a tank without hermits just isnt complete.