I have a mated pair for percs that need to find a new home....They think they need every nem in the tank and are picking fights with my other clowns. They come with a rock (that has there fav. nem.) and the male ad female. they seem to get along with all other fish. The rock is the size of a volley ball so have some room. Make an offer almost no offer will be refused as it is best for the fish.