I have a 75 gallon tank with a huma picasso trigger, maroon yellowstripe clown and two yellowtail damsels. If my huma gets close to the live rock, the yellow tail immediately goes after him. I am shocked. I thought the huma would definately retaliate(sp?). However, I did add the huma last. Both my clown and huma are the same size and they don't bother each other. The huma likes to swim real close to the clown.