a long time ago, i had a yellow Coris wrasse, the one with several small spots on the dorsal fin. He was fine in my tank for more than one year. One day he start to go berserk and torn into my clams. In one morning he kill one of my Maxima and severely damage several others. I have to take him out. Since clams always in my reefs, I have not keep another yellow wrasse since then (1996)