Currently I have a 120 Gallon Reef tank that has been set up for over 2 years now. Over that coarse of time rocks have shifted and fallen. I was wondering what is the risk vs reward of breaking down my reef and rebuilding it both to the fish and corals? It still looks ok but due to the way much of it has shifted I have no room for any other corals. I can live with it the way it is currently but I have this week off work so rearraning was an option. Thanks for your imput.