I like the rock, but I have one qualm. Either half individually looks amazing, but together, it's a bit confusing to look at. I don't know if the third stack is too centered or if it's the location of the stack of rock from the 60, but something is just slightly off...
I think that if you were to replace the frag cave with a real rock, the whole thing would mesh more. (my eye gets drawn to the frag cave)
Now that I think about it, other than that, this scape looks AWESOME and I do in fact love all of the full length trenches and overhangs for the fish to swim in and under.
Good luck finishing up the scape!