Mark, I know I had to try it, it is a huge undertaking. Overall I am glad I did it as I did open it up a little more and made a nice cave arch thing. I ended up moving about 25 #s LR into my basement to open it up more. Wish I had a digital cam so I could have taken some when I had the two big islands. I actually thought it looked OK but my wife thought it looked odd. Not too hard to redo though I would just need take out the big arch and a few other rocks that I joined the two islands togethor with. Man I got stung by alot of bristle worms and corals though. Hopefully the blisters on my arm dont get infected, doh! Good luck if you try it!