Here is the large fake rock in my 300 gal. Cut exactly in half and pressed up against the glass makes two rocks, each side was different. Size is 30 inches wide, 11.5 inches deep and 18 inches high.
Do you really think this rock is cool enough to make two seperate threads about it? Looks to me like it will take up alot of space, which could be used to better ssuit your fish.
I think that looks great! I'd like to see it in the tank. I would like to copy that idea for my 300. It doesn't have fish that hide and it looks a bit bare, so that would be perfect!