I have a fox w 11 other fish, clowns, tang, coral beauty, gobys, fire fish, mandarin, royal gramma, wrasse. All co exist fine. The tang harassed the fox when I put him in. The fox put the spines up and stayed in place. The tang backed off. Fish know what fish to avoid. Now feeding time is crazy, the tang, fox, wrasse, and cb all charge in for food, never has anybody gotten stung