Corals of the same type should be fine in close proximity with each other right? For instance, I have several hammer corals close to each other with occasional touching. I think the large one is stinging or bullying the smaller one off the rock space. Do corals of the same type fight with each other over reef space? Will larger ones kill off smaller ones if given the opportunity? Is this just a survival instinct in them and it makes no difference if they are the same species of coral?