Well? Do you have to glue them together or what? I would think the fish could knock over a rock pile if murphys law is true( and for me it usually is). Also what kind of substrate( i belive thats the word) should i use? I want a reef tank, and this would be my first tank. Thanks, and i love the help with the last post. I still have to go get that live rock from him. But hes been busy at work. I will give a report on the condition of it when i get it.