Man, it goes without saying, that they look very nice and can decorate any aquarium, so make it better, then it has been. But, frankly speaking, there is one thing, that don't give me to put them into my fish tank - they are useless. I used to use only useful thing in my fish tank (One ship doesn't count. Moreover, my girlfriend has made it), so my fish tank is full by live rocks, rather than this useless corals, because of the benefit, that they do. I am talking about that fact, that they play role of the natural filter, so the water cleans faster and the pro cent of oxygen is higher, then it has been without them. Of course, it is your business what to put in your aquarium, but if you decide to fill it with live rocks, you should visit site for getting additional information about them.